How is math used in music?

Answer 1

http://www.google.com/search?q=math+in+music&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

and

http://www.google.com/search?q=plato%27s+republic+math+music&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Answer 2

time signatures, note divisons, and counting out beats and subdivisions of beats.