Music and mathematics seem to be related, but the exact nature of this relation is not very clear. For example, some people see Fibonacci numbers everywhere in music, others think that fractals and algorithms are actually musical compositions, some are inspired by Pythagoras and search for the 'perfect tuning' of their instruments, and some people believe that Mozart coded the secrets of the pyramids in his works... and so on and so on...
There's also a strange theory that says that people who are good at math are good at music too. In the clip you can observe the eminent Nobel Prize winning quantum physicist Richard 'Orange Juice' Feynman testing that theory. And if hard science isn't your thing, why not try Donald Duck's explanation of the relation between music and mathematics.