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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my guess is that music makes us feel or think a certain way every time we listen to it. the artist can help bring out personal emotions/memories of a listener they have never met. Music epitomizes the very thing that makes us social beings without human interaction and due to the range of emotions it can emit, music becomes a drug for the brain. [spoiler]that parrot has better dance moves than most people[/spoiler]