The Geometry of Music

"But Tymoczko may have changed all that. Borrowing some of the mathematics that string theorists invented to plumb the secrets of the physical universe, he has found a way to represent the universe of all possible musical chords in graphic form. "He's not the first to try," says Yale music theorist Richard Cohn. "But he's the first to come up with a compelling answer.""

http://www.time.com/time/magazine/article/0,9171,1582330-1,00.html

http://music.princeton.edu/~dmitri/