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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When I took history of rock and roll at my college we learned that the beat od an average song is 90 bpm, that is also the average time you would be humping a girl when having sex so they're psychological factors as well.