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This use of tools by an animal other than a human was revolutionary, leading anthropologist Louis Leakey to write his famous quote "Now we must redefine tool, redefine Man, or accept chimpanzees as humans."
Now, two more advances in animal research are pushing the definition even further:
First, the recent discovery that chimpanzees create and then hunt with spears (pictured).
And then there is this: an even more revolutionary skill, possessed by a cat. [This link is a video file.]
I think we must now echo Leakey's words and either redefine music, redefine Man, or accept cats as humans.