1 00:00:01,610 --> 00:00:07,290 >>MAJOR FUNDING FOR THIS PROGRAM WAS PROVIDED BY: SHELBY CULLOM DAVIS CHARITABLE FUND INC, 2 00:00:07,290 --> 00:00:13,640 BY ANDREW DAVIS. ADDITIONAL FUNDING WAS PROVIDED BY ACEVES-LONDON 3 00:00:13,640 --> 00:00:21,750 FAMILY FUND AT THE SANTA FE COMMUNITY FOUNDATION AND BARBARA ERDMAN FOUNDATION. 4 00:00:21,750 --> 00:00:29,820 AND BY THE KIND WORLD FOUNDATION, PAT AND RUTH CONNERY, CATHERINE WEEB, HAROLD FOLLEY 5 00:00:29,820 --> 00:00:37,570 AND JENNIE NEGIN, THE ESTATE OF DAVID ELLIOTT YOUNG BY MARY McCACHREN… AND NEW MEXICO 6 00:00:37,570 --> 00:00:41,640 PBS VIEWERS LIKE YOU. THANK YOU. 7 00:00:41,640 --> 00:00:47,380 (birds chirping) 8 00:00:47,380 --> 00:00:59,600 (sipping coffee) 9 00:00:59,600 --> 00:02:27,020 (music begins-“Also sprach Zarathustra”-Richard Strauss) 10 00:02:27,020 --> 00:02:35,020 (phone rings) 11 00:02:35,020 --> 00:02:36,160 >>Rosemary Moore: Hi Dad! 12 00:02:36,160 --> 00:02:38,620 >>Cris Moore: Hey! >>Rosemary: We’re gonna be late for the 13 00:02:38,620 --> 00:02:40,680 concert. Meet Mom and me at the plaza. Come on! 14 00:02:40,680 --> 00:02:44,160 >>Cris: O.K. I’m on my way. 15 00:02:44,160 --> 00:02:46,640 My name is Cris Moore. I’m a mathematician 16 00:02:46,640 --> 00:02:52,880 here at the Santa Fe Institute. I love math, but some of my friends tell me that their 17 00:02:52,880 --> 00:02:55,620 experience with it was a bit more like this. 18 00:02:55,620 --> 00:03:01,660 >>”C squared equals A square plus B squared.” (yawning) 19 00:03:01,660 --> 00:03:04,030 >>Cris: But for me, math is more like this. 20 00:03:04,030 --> 00:03:06,360 Listening to music on the plaza. 21 00:03:06,360 --> 00:03:12,020 (Singing and playing) 22 00:03:12,020 --> 00:03:16,840 >>Cris: It all starts with a vibration. The 23 00:03:16,840 --> 00:03:20,850 drummer strikes the drum, and makes it vibrate. (Drum beat in slow motions)… which makes 24 00:03:20,850 --> 00:03:30,690 the air vibrate… which makes your ear drums vibrate (pulses). Your mind does the rest. 25 00:03:30,690 --> 00:03:42,720 (music continues). Translating those vibrations into beats and tones (singing). 26 00:03:42,720 --> 00:03:49,840 Whether these vibrations come from a drum, a reed or a string, we hear them as musical notes. 27 00:03:49,840 --> 00:03:53,540 (Clarinet and guitar-jazzy music). 28 00:03:53,540 --> 00:03:55,760 >>Cris: each instrument virbates in a unique 29 00:03:55,760 --> 00:04:01,440 way, with a unique mix of frequencies that comes from its shape and materials. From the 30 00:04:01,440 --> 00:04:03,240 math that tells it how to move. 31 00:04:03,240 --> 00:04:06,860 (music) 32 00:04:06,860 --> 00:04:10,280 >>When we put these sounds together, we get 33 00:04:10,280 --> 00:04:16,280 harmonies, chords, melodies, songs… And now math is making music. And whether that 34 00:04:16,280 --> 00:04:21,590 music makes you get up and dance, or sing the blues, or feel truly transcendent, that’s 35 00:04:21,590 --> 00:04:27,620 no coincidence. It’s your intuitive connection to the notes, and the relationships between them. 36 00:04:27,620 --> 00:04:30,180 (Fiddle and bass music) 37 00:04:30,180 --> 00:04:33,010 >>Cris: The ratios and rhythms and patterns 38 00:04:33,010 --> 00:04:39,550 that excite our minds and move our hearts are the same harmonies we find in subatomic 39 00:04:39,550 --> 00:04:49,580 particles, and the motions of planets and stars. Music and math let us hear and see 40 00:04:49,580 --> 00:04:55,500 the patterns all around us. The elegance and wonder of the world. When you come up with 41 00:04:55,500 --> 00:05:01,050 a new melody, or I find a new pattern in math, we’re using the same parts of our brains, 42 00:05:01,050 --> 00:05:06,210 and feeling the same feelings. And I have a feeling it’s getting a bit late. My family! 43 00:05:06,210 --> 00:05:13,730 <Come on, we’ve got to go!> We’re headed to Santa Fe’s historic Lensic Theater. The 44 00:05:13,730 --> 00:05:18,920 seats are filled with music lovers. And, after tonight’s special performance by the Santa 45 00:05:18,920 --> 00:05:23,010 Fe Symphony Orchestra, I hope math lovers as well. 46 00:05:23,010 --> 00:05:27,760 Join me on a journey to discover the Majesty of Music and Math. 47 00:05:27,760 --> 00:05:32,100 (Orchestra performs) 48 00:05:32,100 --> 00:05:48,540 (Applause) 49 00:05:48,540 --> 00:05:52,680 >>Guillermo Figueora: Ladies and gentlemen, the Santa Fe Symphony welcomes you. My name 50 00:05:52,680 --> 00:05:58,150 is Guillermo Figueroa and I have the great honor of being the conductor of this wonderful 51 00:05:58,150 --> 00:06:03,920 orchestra. Joining me on stage tonight is a mathematician and music fan. 52 00:06:03,920 --> 00:06:08,020 Please welcome Cris Moore. 53 00:06:08,020 --> 00:06:15,640 (applause) 54 00:06:15,640 --> 00:06:17,760 >>Moore: You may think of music and math as 55 00:06:17,760 --> 00:06:22,070 separate, but it hasn’t always been this way. In Ancient Greece, music was combined 56 00:06:22,070 --> 00:06:28,360 with arithmetic, geometry, and astronomy in a liberal arts package later called the quadrivium, 57 00:06:28,360 --> 00:06:34,240 the “four-fold way”. Plato believed these four disciplines allowed us to study numbers 58 00:06:34,240 --> 00:06:40,810 and patterns in different ways. Just as geometry lets us see patterns in space, music lets 59 00:06:40,810 --> 00:06:47,800 us hear patterns in time. The most basic connection between music and math is rhythm. If we start 60 00:06:47,800 --> 00:06:51,570 with a steady beat (drum beating: 1:4 time) 61 00:06:51,570 --> 00:06:56,640 >>And add another twice as fast (drum beating: 1:4, 2:4 time) 62 00:06:56,640 --> 00:07:01,910 >>And another twice as fast as that (drum beating: 1:4, 2:4, 4:4 time) 63 00:07:01,910 --> 00:07:07,830 >>We get 4 beats per measure. On the other hand, 3 beats per measure gives 64 00:07:07,830 --> 00:07:16,880 the familiar rhythm of a waltz: (Violin plays waltz beat) 65 00:07:16,880 --> 00:07:21,960 >>Let’s hear the Santa Fe Symphony playing “The Blue Danube.” 66 00:07:21,960 --> 00:08:01,280 (Orchestra plays “Blue Danube” excerpt (Strauss) 67 00:08:01,280 --> 00:08:07,960 (applause) 68 00:08:07,960 --> 00:08:10,490 >>Cris: Some composers alternate these rhythms, 69 00:08:10,490 --> 00:08:14,170 to create interesting combinations. >>Guillermo: Listen to the Santa Fe Symphony, 70 00:08:14,170 --> 00:08:21,070 as we play a selection from Leonard Bernstein's West Side Story, where he alternates two beats 71 00:08:21,070 --> 00:08:28,090 and three beats in his classic celebration of immigrant life in America. Notice how your 72 00:08:28,090 --> 00:08:34,600 ear picks up the alternate rhythms: one-ta-ta, 2-ta-ta and 1-2-3. 73 00:08:34,600 --> 00:09:09,440 (Orchestra plays a selection from “America” (West Side Story Selections-L. Bernstein) 74 00:09:09,440 --> 00:09:15,340 (applause) 75 00:09:15,340 --> 00:09:17,400 >>Cris: Leonard Bernstein created that rhythm 76 00:09:17,400 --> 00:09:23,280 by taking a unit of time and dividing it sometimes into two pieces and sometimes into three. 77 00:09:23,280 --> 00:09:28,930 As we’ll see, ratios like these play a role not just in rhythms, but in notes, chords 78 00:09:28,930 --> 00:09:34,620 and melodies. But, what is a musical note anyway? When the first violinist plays a note 79 00:09:34,620 --> 00:09:46,890 on his violin (note plays), what’s happening in his violin, and in our ears? Well, sound 80 00:09:46,890 --> 00:09:52,800 is vibration. Every time a string wiggles or a hummingbird flaps its wings, a wave of 81 00:09:52,800 --> 00:09:59,240 pressure travels through the air. When a vibration is fast enough, we hear this series of waves 82 00:09:59,240 --> 00:10:04,440 as a continuous tone instead of as individual beats. The number of vibrations per second 83 00:10:04,440 --> 00:10:09,390 is called the frequency, and different notes have different frequencies. For instance, 84 00:10:09,390 --> 00:10:17,740 a middle C, which we’ll now hear from the Symphony’s first trumpet (note plays) vibrates 85 00:10:17,740 --> 00:10:24,060 at a frequency of 261 times a second. On the other hand that low note from the contrabassoon 86 00:10:24,060 --> 00:10:30,800 that you heard at the very beginning of “Also Sprach Zarathustra” (note plays) vibrates 87 00:10:30,800 --> 00:10:36,340 only 33 times per second. That’s such a low frequency that you can almost hear the 88 00:10:36,340 --> 00:10:46,270 individual beats of it, the way we would in a drumroll (drumroll plays) or a cat’s purr 89 00:10:46,270 --> 00:10:53,960 (cat purring, laughter). At the other end of the scale, a high note from a piccolo, 90 00:10:53,960 --> 00:11:00,430 (note plays), is vibrating more than 4,000 times per second. Now, it turns out each time 91 00:11:00,430 --> 00:11:05,820 we go up an octave, for instance from low C, to middle C, to high C, this corresponds 92 00:11:05,820 --> 00:11:11,780 to doubling the frequency, vibrating twice as fast. That high note from the piccolo is 93 00:11:11,780 --> 00:11:16,640 seven octaves above the low note from the contrabassoon, which means it’s vibrating 94 00:11:16,640 --> 00:11:24,960 2, times 2, times 2, times 2 times 2 times 2 times 2, or 128 times faster. 95 00:11:24,960 --> 00:11:30,160 In ancient Greece, Pythagoras discovered the math behind these notes, by doing experiments 96 00:11:30,160 --> 00:11:35,580 on simple instruments. Let’s follow in his footsteps. This is a monochord. It’s just 97 00:11:35,580 --> 00:11:41,240 a string, stretched across a movable bridge, attached to a sound box. We’ve tuned it 98 00:11:41,240 --> 00:11:46,980 so that right now, more or less, it’s a middle C. (plays note). Now let’s see what 99 00:11:46,980 --> 00:11:53,980 happens when we make the string shorter. If we make the string half as long (plays note, 100 00:11:53,980 --> 00:12:01,860 moves bridge), we hear the same note an octave higher, another C. What’s going on? Well, 101 00:12:01,860 --> 00:12:07,060 if the string is half as long, the vibrations have half as far to go along it, so the string 102 00:12:07,060 --> 00:12:14,060 vibrates twice as fast. And that 2:1 ratio corresponds to the octave. Let’s make the 103 00:12:14,060 --> 00:12:19,920 string one-third as long, tripling the frequency from what we had originally. This takes us 104 00:12:19,920 --> 00:12:30,130 to a new note, from C to the G above it (plays note). Here’s a middle C on the piano (plays 105 00:12:30,130 --> 00:12:36,930 note). Each time we go up an octave (plays notes) the frequency gets twice as fast. Each 106 00:12:36,930 --> 00:12:43,190 time we go down by an octave (plays notes) it gets twice as slow. We hear these doublings 107 00:12:43,190 --> 00:12:50,010 without realizing it, but our ears can only take us so far. A grand piano has seven ocatves, 108 00:12:50,010 --> 00:12:56,100 but mathematically these frequencies go on forever, both above and below our hearing. 109 00:12:56,100 --> 00:13:02,870 To help you visualize this, we’ve made you a much grander piano. An endless piano. Below 110 00:13:02,870 --> 00:13:08,360 the notes we can hear, elephants communicate using sub-sonic rumbles (rumbling noise). 111 00:13:08,360 --> 00:13:16,510 And even the earth and sun ring like bells at 16 octaves below middle C. Far above the 112 00:13:16,510 --> 00:13:24,930 notes we can hear, dolphins use high frequency chirps 9 octaves above middle C. Molecules 113 00:13:24,930 --> 00:13:31,850 vibrate trillions of times per second, gamma rays bring us bursts from distant supernovas, 114 00:13:31,850 --> 00:13:38,750 making the electromagnetic field oscillate a billion billion times per second, 60 octaves 115 00:13:38,750 --> 00:13:44,060 above middle C. This range of frequencies, from low to high, 116 00:13:44,060 --> 00:13:48,510 lets the orchestra tell us some amazing stories. Let’s hear the Santa Fe Symphony play the 117 00:13:48,510 --> 00:13:53,000 Grand March from Prokofiev’s Peter and the Wolf… 118 00:13:53,000 --> 00:14:27,140 (Orchestra plays Peter and the Wolf-Prokofiev) 119 00:14:27,140 --> 00:14:34,600 (applause) 120 00:14:34,600 --> 00:14:41,690 >>Cris: When one object vibrates, it can “resonate”, or cause sympathetic vibrations, in another. 121 00:14:41,690 --> 00:14:46,890 Every physical object, such as this wine glass, has natural frequencies at which it likes 122 00:14:46,890 --> 00:14:52,330 to vibrate. (clinks wine glass). If you provide a vibration which is powerful enough, at just 123 00:14:52,330 --> 00:14:58,230 the right frequency, you can create some exciting effects. Famously, if an opera singer sings 124 00:14:58,230 --> 00:15:02,830 loud enough, at just the right tone, she can cause a wine glass to vibrate so much that 125 00:15:02,830 --> 00:15:04,570 it breaks. 126 00:15:04,570 --> 00:15:08,720 (Violinist sings note operatically) 127 00:15:08,720 --> 00:15:13,100 (laughter) 128 00:15:13,100 --> 00:15:18,230 >>Resonances don’t just make things fall apart. They make each musical instrument vibrate 129 00:15:18,230 --> 00:15:24,490 in a unique way. This chladni plate, named after its inventor Ernst Chladni lets us see 130 00:15:24,490 --> 00:15:29,860 the shape of these vibrations. It has a speaker underneath which makes it vibrate and lets 131 00:15:29,860 --> 00:15:36,810 us control the frequency. I'm going to sprinkle some sand on top and once it gets going the 132 00:15:36,810 --> 00:15:40,810 sand will get bounced off the parts of the plate that are vibrating the most, and it 133 00:15:40,810 --> 00:15:45,740 will collect at the still points between them. The shapes and patterns the sand makes will 134 00:15:45,740 --> 00:15:51,640 show us how the plate is responding or resonating to different frequencies. Let's start with 135 00:15:51,640 --> 00:16:00,940 a low frequency. If you remember the monochord, the single stringed instrument from before, 136 00:16:00,940 --> 00:16:06,550 the lowest frequency consists of the entire string going up or down together, but at higher 137 00:16:06,550 --> 00:16:10,000 frequency, one part of the string is wiggling up at the same moment another is wiggling 138 00:16:10,000 --> 00:16:15,460 down. The same thing is happening here and the sand is just collecting at the point in 139 00:16:15,460 --> 00:16:22,960 between them. Let's see what we can do at an even higher frequency. And as the frequency 140 00:16:22,960 --> 00:16:29,060 gets this high the shapes of the vibrations get very complicated. It does look like a 141 00:16:29,060 --> 00:16:34,430 raccoon in a kaleidoscope doesn't it? This violin-shaped plate will give us a taste of 142 00:16:34,430 --> 00:16:39,900 how the soundboard of a violin responds to different musical notes. Of course, real violins 143 00:16:39,900 --> 00:16:48,140 are much more complicated. When you hear a violin being played you should imagine the 144 00:16:48,140 --> 00:16:54,610 body of the violin vibrating with these beautiful intricate patterns, responding to different 145 00:16:54,610 --> 00:17:05,030 notes. It's an amazing degree of complexity it also shows you how a high note on a violin 146 00:17:05,030 --> 00:17:11,190 isn't just a low note played faster. The violin responds in completely different ways to different 147 00:17:11,190 --> 00:17:17,900 tones. This is partly why the sound of the violin is so rich and so complex and sounds 148 00:17:17,900 --> 00:17:26,340 so wonderful in our ears. In fact, even a single note on a violin has many different 149 00:17:26,340 --> 00:17:35,770 frequencies inside it… not just the basic or fundamental one we hear. These layers of 150 00:17:35,770 --> 00:17:41,750 sound give each instrument a unique flavor. We call these hidden frequencies harmonics. 151 00:17:41,750 --> 00:17:48,090 They're kind of like backup singers, singing at frequencies twice as high, three times 152 00:17:48,090 --> 00:17:54,840 as high, and so on above the fundamental. But where are they hiding? Let's look inside 153 00:17:54,840 --> 00:18:00,690 a violin note and see how these harmonics combine to make its unique sound. This audio 154 00:18:00,690 --> 00:18:07,730 analyzer breaks down the violin’s sound wave and shows us the frequencies inside it. 155 00:18:07,730 --> 00:18:13,710 These Peaks here show how strong the different harmonics are and how much each one contributes 156 00:18:13,710 --> 00:18:20,940 to the sound. The fundamental frequency and the hidden harmonics two, three, four times 157 00:18:20,940 --> 00:18:27,240 as high and so on. Now let's try to reconstruct the violin by putting these harmonics back 158 00:18:27,240 --> 00:18:34,080 together. If we play just the fundamental… it doesn't sound like a violin at all. Let's 159 00:18:34,080 --> 00:18:40,690 add the second harmonic… and the third. As we add more harmonics including more and 160 00:18:40,690 --> 00:18:50,720 more of these hidden frequencies the richness and color of the real violin appear. 161 00:18:50,720 --> 00:18:55,330 Let's hear how the same note sounds on different instruments, each with its own unique mix 162 00:18:55,330 --> 00:19:01,980 of harmonics. Here's a middle C on the oboe… 163 00:19:01,980 --> 00:19:08,480 the trombone… 164 00:19:08,480 --> 00:19:11,980 the piano… 165 00:19:11,980 --> 00:19:17,330 and a kazoo. 166 00:19:17,330 --> 00:19:22,590 We love how the orchestra uses these instruments to represent different characters. In our 167 00:19:22,590 --> 00:19:25,630 next piece, We’ll hear the finale from Prokofiev's “Peter 168 00:19:25,630 --> 00:19:30,980 and the Wolf.” See if you can hear all the different characters in it including the flute 169 00:19:30,980 --> 00:19:41,520 as the bird… 170 00:19:41,520 --> 00:19:56,380 the oboe as the duck… 171 00:19:56,380 --> 00:20:13,650 and the clarinet as the cat, and the bassoon as the grandfather have now joined the parade… 172 00:20:13,650 --> 00:20:19,000 Here's the Santa Fe Symphony playing the finale from Prokofiev's "Peter and the Wolf". 173 00:20:19,000 --> 00:21:33,180 (Orchestra plays “Peter and the Wolf”-Prokofiev) 174 00:21:33,180 --> 00:21:40,140 (Applause) 175 00:21:40,140 --> 00:21:42,110 >>Cris: We've learned that the unique sound 176 00:21:42,110 --> 00:21:48,250 of each instrument comes from its shape and how it resonates, but when you add electrons, 177 00:21:48,250 --> 00:21:55,120 vacuum tubes, and antennas to the mix things get even more interesting. Let's visit a remarkable 178 00:21:55,120 --> 00:22:02,630 workshop in Santa Fe to learn more about this. It's a place filled with rare antique clocks 179 00:22:02,630 --> 00:22:08,410 and vintage electronics too. The man at the center of this collection is Andrew Barron. 180 00:22:08,410 --> 00:22:24,900 You can hear him now playing one of his prized possessions. (theremin in the background) 181 00:22:24,900 --> 00:22:29,160 “Hey Andrew!” >>Andrew Barron: Chris it's good to see you. 182 00:22:29,160 --> 00:22:30,790 >>Cris: Thanks so much for showing me your workshop. 183 00:22:30,790 --> 00:22:34,090 >>Andrew: It's my pleasure. >>Cris: This is fantastic. This is an original 184 00:22:34,090 --> 00:22:36,470 Theremin? >>Andrew: It is. it's one of the 120 or so 185 00:22:36,470 --> 00:22:39,810 that survived from the original 1929 production by RCA. 186 00:22:39,810 --> 00:22:44,390 >>Cris: So one of these antennas controls the frequency and the other controls the loudness? 187 00:22:44,390 --> 00:22:48,940 >>Andrew: Exactly right. Yes. When you bring your hand close to this antenna the note goes 188 00:22:48,940 --> 00:22:57,260 higher and if you want to make it louder you can 189 00:22:57,260 --> 00:23:03,500 bring your left hand up over this loop on the left side of the cabinet. 190 00:23:03,500 --> 00:23:09,310 >>Cris: So, this is an electronic instrument. You might think it would make a boring simple 191 00:23:09,310 --> 00:23:11,670 beep, but the sound is so much richer than that. 192 00:23:11,670 --> 00:23:15,380 >>Andrew: Leon Theremin wanted something that was harmonically rich, that would emulate 193 00:23:15,380 --> 00:23:21,410 the sound of orchestra instruments. And, he did it by having two frequency generators 194 00:23:21,410 --> 00:23:26,410 in the instrument, we call them oscillators. Theremin connected one of those oscillators 195 00:23:26,410 --> 00:23:32,250 to this antenna that controls the pitch and so when you bring your hand near it, it shifts 196 00:23:32,250 --> 00:23:38,190 the frequency of that one oscillator and it tugs on the other, and it actually pulls that 197 00:23:38,190 --> 00:23:43,690 pure symmetrical wave into a different shape. >>Cris: It creates some more complex <yes> 198 00:23:43,690 --> 00:23:45,360 sound wave. >>Andrew: Exactly right. 199 00:23:45,360 --> 00:23:46,470 >>Cris: Can I try it out? >>Sure. 200 00:23:46,470 --> 00:23:49,740 >>Cris: I promise I won't break it. >>Andrew: That's all right. Come over here 201 00:23:49,740 --> 00:23:53,050 and let me lead this for the moment, okay. 202 00:23:53,050 --> 00:24:00,300 (playing the theremin-“Auld Lang Syne) 203 00:24:00,300 --> 00:24:03,860 >>Cris: People associate this now with bad 204 00:24:03,860 --> 00:24:08,510 sci-fi and horror movies, but back in the 20s and 30s this was an instrument… it was 205 00:24:08,510 --> 00:24:11,820 part of the orchestra, people wrote music for it. There were great players. 206 00:24:11,820 --> 00:24:17,660 >>Andrew: The original repertoire was actually all classical, and in the first decade or 207 00:24:17,660 --> 00:24:24,620 so of the instrument’s existence. It wasn't until 1945 Alfred Hitchcock, using theremin 208 00:24:24,620 --> 00:24:27,300 in the soundtrack of a movie called “Spellbound.” 209 00:24:27,300 --> 00:24:38,640 (Clip from the movie with theremin playing in the background.) 210 00:24:38,640 --> 00:24:43,540 >>Cris: And who were the great players, the famous virtuoso of the theremin back in the 211 00:24:43,540 --> 00:24:46,720 day? >>Andrew: The really superstar of her day 212 00:24:46,720 --> 00:24:51,830 was Clara Rockmore and she performed with the Philadelphia Orchestra. 213 00:24:51,830 --> 00:24:56,280 >>Cris: Let's relive the glory days of the theremin and listen to Clara Rockmore. 214 00:24:56,280 --> 00:25:22,200 (Clara Rockmore Theremin Performance) 215 00:25:22,200 --> 00:25:26,590 >>Cris: Harmonics are part of the math inside individual notes, but they also let us combine 216 00:25:26,590 --> 00:25:31,450 notes into melodies and harmonies that are beautiful to the ear. Remember how going up 217 00:25:31,450 --> 00:25:36,620 an octave corresponded to doubling the frequency or ratio of two to one? About as simple as 218 00:25:36,620 --> 00:25:41,630 a ratio could be. It turns out that many of the most beautiful chords and harmonies come 219 00:25:41,630 --> 00:25:46,240 from ratios that are almost as simple. >>Guillermo: For instance, if you take middle 220 00:25:46,240 --> 00:25:52,610 C and play the G right above that, we get a ratio of three to two, what we musicians 221 00:25:52,610 --> 00:26:01,780 call a fifth, and it sounds like this (notes played on trumpet). 222 00:26:01,780 --> 00:26:08,280 If we take that same G, and play the C right above that we get a ratio of four to three… 223 00:26:08,280 --> 00:26:17,060 what we call a Fourth. And it sounds like this… (notes played on trumpet) 224 00:26:17,060 --> 00:26:24,170 A ratio of 5 to 4 gives us the ingredients of major chords such as C major, which is 225 00:26:24,170 --> 00:26:37,740 made up of C, E & G, and we’ll add another C in the middle just for fun. So, we get a 226 00:26:37,740 --> 00:26:47,440 C major chord (chord played). And, a ratio of six to five gives us a minor 227 00:26:47,440 --> 00:26:55,940 chord, as in C minor (chord played). Now, in case you've recognized all this little 228 00:26:55,940 --> 00:27:03,700 excerpts we just played, it's because that's the iconic beginning of "Also sprach Zarathustra" 229 00:27:03,700 --> 00:27:10,720 of Ricard Strauss, with which this program opened. Let's hear it again. 230 00:27:10,720 --> 00:27:23,500 (Orchestra plays excerpt from “Also sprach Zarathustra”-Strauss) 231 00:27:23,500 --> 00:27:30,690 >>Cris: Thank you. These ratios have been resonating with us long before Ricard Strauss 232 00:27:30,690 --> 00:27:35,450 used them in his compositions, and to help us understand this ancient connection between 233 00:27:35,450 --> 00:27:40,690 music and math, my friend Penelope Penland has organized this party at the Hotel Santa 234 00:27:40,690 --> 00:27:45,280 Fe. Hey Penelope. Nice to see you. >>Penelope: How are you? 235 00:27:45,280 --> 00:27:52,430 >>Cris: Everybody, your attention please. Thank you very much for being here tonight. 236 00:27:52,430 --> 00:27:57,000 Humans have been making music for as long as we've been human. Whether you write music, 237 00:27:57,000 --> 00:28:01,890 play it, or just listen to it, you're part of that history. And beautiful music has beautiful 238 00:28:01,890 --> 00:28:09,590 math behind it; patterns that we sense intuitively, that make music fun, moving and sacred. Hildegard 239 00:28:09,590 --> 00:28:14,160 von Bingen is one of the earliest composers whose name has come down to us and one of 240 00:28:14,160 --> 00:28:19,580 the earliest we know of who wrote complex melodies. Here is the University of New Mexico's 241 00:28:19,580 --> 00:28:25,200 Hildegard Schola performing one of her pieces. 242 00:28:25,200 --> 00:29:29,220 (singing) 243 00:29:29,220 --> 00:29:35,880 (applause) 244 00:29:35,880 --> 00:29:40,020 >>Cris: The music you just heard is almost a thousand years old, but these patterns go 245 00:29:40,020 --> 00:29:45,430 back even farther. Thousands of years ago, Native American flute makers here in New Mexico 246 00:29:45,430 --> 00:29:50,360 created beautiful instruments, and these ratios still ring in their music today. 247 00:29:50,360 --> 00:29:56,970 >>Penelope: I'm delighted to have you all meet Marlon Magdalena from Jemez Pueblo, and 248 00:29:56,970 --> 00:30:01,340 I'm so interested in your flutes. >>Marlon: Most of these flutes I've handmade. 249 00:30:01,340 --> 00:30:05,700 This particular one, I've hand-carved with a small knife, to get the shapes that you 250 00:30:05,700 --> 00:30:11,030 see on here. So, as a person from Jemez Pueblo, we have traditional ways of life, and a lot 251 00:30:11,030 --> 00:30:17,500 of those ways are very religious. So we view everything that we do as a part of that religion, 252 00:30:17,500 --> 00:30:22,860 as a part of our way of life. So this song that I'm gonna play, it's called “Welcoming the Buffaloes." 253 00:30:22,860 --> 00:31:25,580 (flute performance) 254 00:31:25,580 --> 00:31:32,580 (applause) 255 00:31:32,580 --> 00:31:37,260 >>Cris: before humans ever walked the earth, these ratios and resonances were at work in 256 00:31:37,260 --> 00:31:42,010 the universe. Ganymede, Europa and IO, three of the moons 257 00:31:42,010 --> 00:31:46,710 of Jupiter that Galileo saw through his telescope, which you can see too, through a backyard 258 00:31:46,710 --> 00:31:53,220 telescope or even a decent pair of binoculars, are in a 1 to 2 to 4 resonance. In the time 259 00:31:53,220 --> 00:31:58,880 it takes Ganymede to go around Jupiter once, Europa goes around twice and IO goes around 260 00:31:58,880 --> 00:32:04,740 four times. It's as if they're singing a low C, a middle C, and a high C. The music of 261 00:32:04,740 --> 00:32:09,820 the spheres has always inspired music down here on earth. The composer Gustav Holst may 262 00:32:09,820 --> 00:32:14,060 have been thinking more of astrology then astronomy when he wrote his suite, “The 263 00:32:14,060 --> 00:32:19,390 Planets,” but it’s full of these heavenly ratios. If you listen carefully to his movement, 264 00:32:19,390 --> 00:32:25,110 “Mars the Bringer of War,” you'll hear that he uses a rhythm of five beats per measure 265 00:32:25,110 --> 00:32:29,990 to create a menacing march toward battle, with a mixture of pleasant and unpleasant 266 00:32:29,990 --> 00:32:36,580 harmonies. Here's the Santa Fe Symphony playing Mars from Holst's, “The Planets” 267 00:32:36,580 --> 00:35:21,160 (Orchestra performs an excerpt from “The Planets”-Holst) 268 00:35:21,160 --> 00:35:27,640 (applause) 269 00:35:27,640 --> 00:35:30,820 >>Cris: One of the things which makes “Mars's 270 00:35:30,820 --> 00:35:36,190 March to War” so menacing is a chord called the tritone, or the devil's interval. Remember 271 00:35:36,190 --> 00:35:43,250 the pleasing sounds of the fifth? (chord played) The tritone is just one 272 00:35:43,250 --> 00:35:52,410 semitone lower, but that makes all the difference (Chord played). Sounds strange doesn't it? 273 00:35:52,410 --> 00:35:58,180 Dissonant, and unsettling. See if you can hear it in Ricard Wagner's classic chord from 274 00:35:58,180 --> 00:36:05,800 “Tristan and Isolde,” where he uses it to convey the tragedy of those two lovers. 275 00:36:05,800 --> 00:36:24,920 (Orchestra performs excerpt from “Tristan and Isolde”) 276 00:36:24,920 --> 00:36:33,800 >>Cris: A tritone is exactly half of an octave. For instance, it takes us from C up to F sharp 277 00:36:33,800 --> 00:36:40,460 and another tritone will take us from there up to the next C. But remember that going 278 00:36:40,460 --> 00:36:47,610 up by an octave is equivalent to multiplying by 2, so that means the tritone must multiply 279 00:36:47,610 --> 00:36:55,750 by something, which when we multiply it by itself again, we get 2. We call that number 280 00:36:55,750 --> 00:37:01,870 the square root of 2, but it isn't a simple fraction. It isn't the ratio of any pair of 281 00:37:01,870 --> 00:37:09,950 whole numbers. Lots of ratios come close, but nothing quite works. Written in decimal, 282 00:37:09,950 --> 00:37:17,060 the square root of 2 never ends or repeats. It goes on forever like pi. We call it an 283 00:37:17,060 --> 00:37:23,810 irrational number. The followers of Pythagoras loved whole numbers, so this came as quite 284 00:37:23,810 --> 00:37:29,750 a shock. Legend tells that they threw its discoverer overboard to punish him. Perhaps 285 00:37:29,750 --> 00:37:35,590 this irrationality is why the tritone sounds so strange and why composers like Wagner use 286 00:37:35,590 --> 00:37:41,560 it to create dissonance and tension. Chords and melodies that step outside the simple 287 00:37:41,560 --> 00:37:46,890 Pythagorean intervals are called chromatic from the Greek chroma for color, and they 288 00:37:46,890 --> 00:37:52,790 add a lot of color to a piece. Composers like John Williams use them to express the eerie 289 00:37:52,790 --> 00:37:58,530 and the unfamiliar, like a school of teenage wizards fighting the forces of darkness. 290 00:37:58,530 --> 00:38:03,980 Next, the Santa Fe Symphony goes to Hogwarts. 291 00:38:03,980 --> 00:40:34,620 (Orchestra performs an excerpt from “Harry Potter”- John Williams) 292 00:40:34,620 --> 00:40:43,580 (applause) 293 00:40:43,580 --> 00:40:46,940 >>Cris: We've seen and heard that humans love 294 00:40:46,940 --> 00:40:52,190 patterns. We’re tuned to enjoy them without even realizing it. We like making patterns 295 00:40:52,190 --> 00:40:55,960 where there were none before, and we like finding them when they were hidden. That's 296 00:40:55,960 --> 00:41:01,590 why we like puzzles so much, and at our house puzzles are a big deal. Hey guys. 297 00:41:01,590 --> 00:41:04,430 >>Rosemary: Hi. >>Cris: What did you just build there? 298 00:41:04,430 --> 00:41:10,230 >>Rosemary: This is a soccer ball. >>Cris: In both mathematics and music, a classic 299 00:41:10,230 --> 00:41:19,740 kind of pattern comes from symmetry. We look about the same if you flip our image in a 300 00:41:19,740 --> 00:41:25,500 mirror. Some of our more distant relatives look the same if you rotate them. These intricate 301 00:41:25,500 --> 00:41:31,840 moorish mosaics from the Alhambra in Spain look the same if we shift them over, or rotate 302 00:41:31,840 --> 00:41:43,120 them. Another kind of symmetry, both in mathematics and the natural world, is a fractal. A fractal 303 00:41:43,120 --> 00:41:47,410 is something which, when you zoom in on it, it looks the same, because each part is a 304 00:41:47,410 --> 00:41:50,830 smaller copy of the whole. >>Rosemary: Hey Dad, we have a fractal in 305 00:41:50,830 --> 00:41:53,840 the fridge. >>Cris: A fractal in the fridge? <Yeah> A 306 00:41:53,840 --> 00:41:57,420 fractal in the fridge? >>Rosemary: We got it the other day while 307 00:41:57,420 --> 00:42:02,070 we were at the farmers market >>Cris: Nice. It's a broccoli. <Yeah> But, 308 00:42:02,070 --> 00:42:05,370 what makes it a fractal? >>Rosemary: See how there's one big cone <uh-huh>. 309 00:42:05,370 --> 00:42:09,770 This cone is made up of lots of little cones which are made up of lots of little cones 310 00:42:09,770 --> 00:42:13,370 which are made of lots of little cones, which just keeps getting smaller and smaller. 311 00:42:13,370 --> 00:42:15,920 >>Cris: Can we eat it later? >>Rosemary: Yeah! 312 00:42:15,920 --> 00:42:22,650 >>Cris: The most famous fractal is the Mandelbrot set. Zooming in on different areas reveals 313 00:42:22,650 --> 00:42:30,850 endless variety, but always with a smaller copy. The entire set hiding deep inside it. 314 00:42:30,850 --> 00:42:36,570 A musical fractal would be a piece where the theme harmonizes with a slowed down version 315 00:42:36,570 --> 00:42:42,400 of itself. That way, the small-scale structure of the piece is echoed on a larger, grander 316 00:42:42,400 --> 00:42:45,070 scale. >>Guillermo: Johann Sebastian Bach loved to 317 00:42:45,070 --> 00:42:51,940 play with symmetry. In many of his fugues, the themes are heard upside down or even backwards. 318 00:42:51,940 --> 00:42:57,070 He also liked to play with fractal symmetry, where the themes are given in different scales 319 00:42:57,070 --> 00:43:03,040 or sped up or slowed down. We're gonna play a fugue by Bach and you'll hear first the 320 00:43:03,040 --> 00:43:13,020 theme in the French horn… 321 00:43:13,020 --> 00:43:26,260 And then an upside down version of it in the second trumpet... 322 00:43:26,260 --> 00:43:46,700 And a slowed down version of it in the first trumpet... 323 00:43:46,700 --> 00:44:18,700 And finally, a slowed down version of the theme on the tuba... 324 00:44:18,700 --> 00:44:22,870 Now see if you can hear all of these themes 325 00:44:22,870 --> 00:44:27,730 as members of the brass section of the Santa Fe Symphony put it all together when they 326 00:44:27,730 --> 00:44:44,240 play Contrapunctus Number Seven from the "Art of the Fugue" by Johann Sebastian Bach. 327 00:44:44,240 --> 00:47:46,580 (Music) 328 00:47:46,580 --> 00:47:55,240 (applause) 329 00:47:55,240 --> 00:48:00,320 >>Cris: Our brains love music like that Bach Fugue, because we love patterns. We love to 330 00:48:00,320 --> 00:48:05,610 recognize a melody and hear it again in a new form. But, we also love to be surprised. 331 00:48:05,610 --> 00:48:11,040 We love it when patterns go sideways and turn out to be more complicated than we thought. 332 00:48:11,040 --> 00:48:16,260 Take the prime numbers for example. A prime is a number which cannot be broken down into 333 00:48:16,260 --> 00:48:22,520 smaller factors. Five and seven are prime, but six isn't because it's two times three. 334 00:48:22,520 --> 00:48:28,620 We can find the primes, if we're willing to do a little work. Start with all the numbers. 335 00:48:28,620 --> 00:48:36,950 One doesn't count. Circle two, and now cross out all the even ones. Next, circle three 336 00:48:36,950 --> 00:48:43,540 and cross out all the multiples of three. Six, nine, 12… and so on. The next one left 337 00:48:43,540 --> 00:48:49,460 over is five. Circle it, and cross out the multiples of five. Circle seven, and cross 338 00:48:49,460 --> 00:48:57,780 out its multiples. And so on. The ones that are left are the primes. That wasn't so hard, 339 00:48:57,780 --> 00:49:02,490 but the primes have many secrets. You'll notice that there are some pairs of primes that are 340 00:49:02,490 --> 00:49:10,430 just two apart. 5 and 7, 11 and 13 and so on. But what's the pattern here? Are there 341 00:49:10,430 --> 00:49:16,330 an infinite number of these pairs? Do they go on forever? No one knows. It's these patterns 342 00:49:16,330 --> 00:49:21,490 and surprises that fascinate me as a mathematician. They're what makes math so intriguing and exciting. 343 00:49:21,490 --> 00:49:25,680 >>Guillermo: Prime numbers can add suspense 344 00:49:25,680 --> 00:49:32,850 to music. Here's a piece in five beats, a prime number, which creates a sense of excitement 345 00:49:32,850 --> 00:49:39,220 and international intrigue. 1, 2, 3, 4, 5. 1… 2… 3… 4… 5… 346 00:49:39,220 --> 00:50:16,000 (Music-"Mission Impossible Theme.") 347 00:50:16,000 --> 00:50:22,740 (applause) 348 00:50:22,740 --> 00:50:29,320 >>Cris: We've heard the math inside notes and instruments, the ratios that make up rhythms, 349 00:50:29,320 --> 00:50:39,210 chords and harmonies and the symmetries and surprises that make music so fascinating, 350 00:50:39,210 --> 00:50:46,340 from ancient times to today. Music and math both reveal something fundamental about our 351 00:50:46,340 --> 00:50:55,560 world… a tension between simplicity and complexity, between order and chaos. They 352 00:50:55,560 --> 00:51:07,070 speak to our brains and our hearts in endlessly surprising ways. And they're both very much 353 00:51:07,070 --> 00:51:16,840 a part of what makes us human. In our finale tonight, the composer John Adams starts out 354 00:51:16,840 --> 00:51:21,550 with a simple rhythm on the wood block, but he quickly overlays this with more and more 355 00:51:21,550 --> 00:51:26,670 complex rhythms, making it harder and harder for us to hold onto it all. If you can feel 356 00:51:26,670 --> 00:51:32,220 this joyful confusion, the sense that a pattern is always just a little too complicated to 357 00:51:32,220 --> 00:51:36,750 grasp, so that you're always just on the brink of understanding it, you'll know what it's 358 00:51:36,750 --> 00:51:43,330 like to explore the frontiers of mathematics. Ladies and gentlemen the Santa Fe Symphony 359 00:51:43,330 --> 00:51:46,880 playing John Adams's "Short ride in a Fast Machine." 360 00:51:46,880 --> 00:56:12,820 (music) 361 00:56:12,820 --> 00:57:28,500 (Applause) 362 00:57:28,500 --> 00:57:31,340 >>MAJOR FUNDING FOR THIS PROGRAM WAS PROVIDED BY: 363 00:57:31,340 --> 00:57:37,360 SHELBY CULLOM DAVIS CHARITABLE FUND INC, BY ANDREW DAVIS. 364 00:57:37,360 --> 00:57:41,580 ADDITIONAL FUNDING WAS PROVIDED BY ACEVES-LONDON FAMILY FUND AT THE SANTA FE COMMUNITY FOUNDATION. 365 00:57:41,580 --> 00:57:47,360 AND BARBARA ERDMAN FOUNDATION. 366 00:57:47,360 --> 00:57:56,180 AND BY THE KIND WORLD FOUNDATION, PAT AND RUTH CONNERY, CATHERINE WEBB, HAROLD FOLLEY 367 00:57:56,180 --> 00:58:03,670 AND JENNIE NEGIN, THE ESTATE OF DAVID ELLIOTT YOUNG BY MARY McCACHREN… AND NEW MEXICO 368 00:58:03,670 --> 00:58:08,670 PBS VIEWERS LIKE YOU. THANK YOU.