You would think it is easy to explain.
Some evolutionary psychologists suggest that music originated as a way for males to impress and attract females. Others see its roots in the relationship between mother and child. In a third hypothesis, music was a social adhesive, helping to forge common identity in early human communities.
That's nice. Can the evlutionary psychologists prove it?
``They're completely bogus explanations, because they assume what they set out to prove: that hearing plinking sounds brings the group together, or that music relieves tension," he [Steven Pinker] says. ``But they don't explain why. They assume as big a mystery as they solve." Music may well be innate, he argues, but that could just as easily mean it evolved as a useless byproduct of language, which he sees as an actual adaptation.
From the essay Survival of the harmonious at the Boston Globe.
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That's nice. Can he prove it?
Don't the gibbons sing? Perhaps it is innate.