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The mention of music and evolution sent me off on a tangent, which was to wonder why human brains have a sense of music. A lot of music theory makes mathematical sense (the overtone series), but it seems odd from an evolution standpoint that musicianship was a good allele to have.
I believe the current theory is that musical talent was a sexual selection criteria that 'blew up'. Good rhythm, a good singing voice, and an ability to remember complex rhythm were originally linked to timing and muscle coordination, and so helped to signal for hunting fitness; and to intelligence, and so helped to signal for the ability to navigate the pack's social landscape. But once sexual selection for a trait begins, that trait can take on a life of its own, leading to things like peacocks' tails and lyre bird's mating calls.
This article from 2005 says that while there are some different theories about the evolution of music, there is not enough evidence yet to reach a conclusion. http://www.cns.nyu.edu/~jhm/mcdermott_hauser_mp.pdf
In another article, Geoffrey F. Miller explained that Darwin hypothesized that hominids might have included some music in their courtship, similar to birdsong, before the development of language. Darwin's theory is described pretty clearly in the refrain of "Who Put the Bomp," but you can also google the article.
G. F. (2000). Evolution of human music through sexual selection. In N. L. Wallin, B. Merker, & S. Brown (Eds.), The origins of music, MIT Press, pp. 329-360.