Why do we like music? Is it related to speech? Is it entirely social? The only animals I know of that enjoy it as much as us are birds. (most mammals, even chimps and dogs, ignore music)
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If you believe in evolution, it's probably because back in our tribal days music brought us together and helped us share a sense of unity, thereby strengthening the bonds we have with each other, and thus, strengthening our people as a whole and keeping out survivability up. Keep in mind this is from an evolutionary point of view. I don't necessarily believe it, it's just something I thought out while in the shower.