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In the world of music science, there is a lot of interest in "animal music", or, perhaps more precisely, in those animal sounds that are plausibly analogous in some way to human music.
The Origins of Music (MIT Press 2000), edited by Wallin, Merker and Brown, contains a section "Vocal Communication in Animals" with eight articles about different animal calls and their possible relationship to human music. Groups of animals considered to be of interest include primates, birds and whales.
The very existence of terms like "birdsong" gives testament to our tendency to perceive the sounds that other animals make as forms of music. There is also an apparent level of creativity in some forms of animal song; in particular whales and some birds are found to invent new "songs".
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