What is Machine Listening? (Part 2)

Music has been always with us (I mean, human beings) throughout history. It wouldn't be so necessary to bring out the official definition of music here, but we call any sound that has a rhythmic or melodic feature as music. Probably, it doesn't necessarily give us pleasure but it definitely gives some emotional influence by listening to it. This appears to be borne out by the archaeological evidence. While the first hand axes and spears date back about 1.7 million years and 500,000 years respectively, the earliest known musical instruments are just 40,000 years old. It might be relatively recent compare to the first hand axes and spears, but 40,000 years is already a quite long time ago.