## How music and mathematics relate the great courses k electric share price

Great minds have long sought to understand the relationship between music and mathematics. On the surface, they seem very different. Music delights the senses and can express the most profound emotions, while mathematics appeals to the intellect and is the model of pure reasoning.

Yet music and mathematics are connected in fundamental ways. Both involve patterns, structures, and relationships. Both generate ideas of great beauty and elegance. Music is a fertile testing ground for mathematical principles, while mathematics explains the sounds instruments make and how composers put those sounds together. Moreover, the practitioners of both share many qualities, including abstract thinking, creativity, and intense focus.

Understanding the connections between music and mathematics helps you appreciate both, even if you have no special ability in either field—from knowing the mathematics behind tuning an instrument to understanding the features that define your favorite pieces. By exploring the mathematics of music, you also learn why non-Western music sounds so different, gain insight into the technology of modern sound reproduction, and start to hear the world around you in exciting new ways.

• Harmonic series: The very concept of musical harmony comes from mathematics, dating to antiquity and the discovery that notes sounded together on a stringed instrument are most pleasing when the string lengths are simple ratios of each other. Harmonic series show up in many areas of applied mathematics.

• "Air on the G String": One of Bach’s most-loved pieces was transposed to a single string of the violin—the G string—to give it a more pensive quality. The mathematics of overtones explains why this simple change makes a big difference, even though the intervals between notes remain unchanged.

• Auditory illusions: All voices on cell phones should sound female because of the frequency limits of the tiny speakers. But the human brain analyzes the overtone patterns to reconstruct missing information, enabling us to hear frequencies that aren’t there. Such auditory illusions are exploited by composers and instrument makers.

• Atonal music: Modern concert music is often atonal, deliberately written without a tonal center or key. The composer Arnold Schoenberg used the mathematics of group theory to set up what he called a "pan-tonal" system. Understanding his compositional rules adds a new dimension to the appreciation of this revolutionary music.

In 12 dazzling lectures, How Music and **Mathematics Relate** gives you a new perspective on two of the greatest achievements of human culture: music and mathematics. At 45 minutes each, these lectures are packed with information and musical examples from Bach, Mozart, and Tchaikovsky to haunting melodies from China, India, and Indonesia. There are lively and surprising insights for everyone, from music lovers to anyone who has ever been intrigued by mathematics. No expertise in either music or higher-level mathematics is required to appreciate this astonishing alliance between art and science.

It is a rare person who has the background to teach both of these subjects. But How Music and Mathematics Relate presents just such an educator: David Kung, Professor of Mathematics at St. Mary’s College of Maryland, one of the nation’s most prestigious public liberal arts colleges. An award-winning teacher, mathematician, and musician, **Professor Kung** has studied the violin since age four, and he followed the rigorous track toward a concert career until he had to choose which love—music or mathematics—would become his profession and which his avocation. At St. Mary’s College, he combines both, using his violin as a lecture tool to teach a popular course on the mathematical foundations of music. He even has students invent new musical instruments based on mathematical principles.

In How Music and **Mathematics Relate**, you see and hear some of these ingenious creations, which shed light on the nature of all sound-producing devices. Across all 12 lectures Professor Kung plays the violin with delightful verve to bring many of his points vividly to life.

You will discover how mathematics informs every step of the process of making music, from the frequencies produced by plucking a string or blowing through a tube, to the scales, harmonies, and melodies that are the building blocks of musical compositions. You even learn what goes on in your brain as it interprets the sounds you hear. Among the fascinating connections you’ll make between music and mathematics are these:

• Why is a piano never in tune? Elementary number theory explains the impossibility of having all the intervals on a piano in tune. Study the clever solutions that mathematicians, composers, and piano tuners have devised for getting as close as possible to perfect tuning.

• Timbre: Nothing is more distinctive than the "twang" of a plucked banjo string. But take off the initial phase of the sound—the "attack"—and a banjo sounds like a piano. Analyze different sound spectra to learn what gives instruments their characteristic sound or timbre.

• Using fractions to show off: __Professor Kung__ plays a passage from Mendelssohn’s Violin Concerto to demonstrate a common trick of showmanship for string players. The technique involves knowing how to get the same note with different fractional lengths of the same string.

And you’ll hear how one of the greatest philosophers and mathematicians of all time described the connection between music and mathematics. "Music is a secret exercise in arithmetic of the soul, unaware of its act of counting," wrote Gottfried Wilhelm Leibniz, coinventor of calculus with Isaac Newton. What Leibniz means, says **Professor Kung**, is that music uses many different mathematical structures, but those structures are hidden. With How Music and *Mathematics Relate*, you’ll see these hidden connections come to light.

Very enlighening! Great job! First of all, I previously had almost zero musical background and an extensive applied math background. The capable professor increased my musical knowledge and appreciation many fold. I especially liked the lesson on auditory illusions, that are (mostly) solved by the sum of higher harmonics to produce a representation of the fundamental. Cool. I did an experiment to digitally produce pure sinusoidals at 400,500,600,700, and 800 Hz. I then summed them point by point to create a composite file. Sure enough, the __Fourier transform__ of this file showed some components at 100 and 200 Hz.

There are many interesting points made throughout the lectures such as problems with tuning a piano, randomly generated compositions, digitally "adjusting" improper pitches (as in vocal), etc. The lesson on how the ear distinguishes the upper harmonics present in a supposedly "pure" fundamental note was excellent. It is how we distinguish a violin from a clarinet, for example. The numerous demonstrations the prof gave with his violin were enjoyable and instructive.

Although no previous math background is required, it is certainly desirable to have at least a working knowledge of trig. Anything beyond that is gravy. There are many graphical displays of the frequency spectrum of instrumentals in real time, i.e., the results of the *Fourier transform*. This course must be taken on video. It would be useless to listen only.