The tamarin experiment involved playing different types of music to see if monkeys respond to music, or if only humans do. They played a variety of 30-second clips including music experts had devised from monkey sounds.

While they reacted to the monkey music, the only human music they paid attention to was Metallica's � and it made them calm and relaxed rather than the response straight-laced lab geeks expected. - beer good! Napster bad! read more here

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