What does the 'piece' mean in the following passage?

The notion that individual pieces of popular music may be distinguishable by their own identity or character is common across popular music genres. But, as with ‘piece’, this notion is not necessarily established by virtue of the composed element alone. Performance, whether live or recorded, and technical production in the recording studio are major sites of the elements that enable identity distinctions to be drawn between pieces...

I don't get it clearly in the context.

closed as off-topic by Dan Bron, JEL, NVZ, Xanne, David Jun 18 '17 at 17:42

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It holds a slightly different, but not totally incomprehensible, meaning in music lingo.

See piece of music, defined by the free dictionary as

piece of music - a musical work that has been created, musical composition

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