This assumes that an appreciation of music is specifically selected for, which seems far-fetched to me. I see music in the same way that I see other arts an humanities where the appreciation is a by-product of other selected traits, such as language acquisition and production, pattern finding, etc. I believe there has been some research to suggest that music can be composed for other animals, matching their hearing abilities, communication sounds and the like. This is contrary to "we evolved music specifically." Music may allow us to practice strong emotions, but so may painting, story, games, pornography, and cooking. That's a far cry from saying we evolved the ability for cubism and abstract expressionism in order to practice feeling emotions. You can say we can practice feeling strong emotions through art, therefor art. But it's hard to posit the inverse of that sentence.