When you feel it's not really music anymore, it's probably sound art. The expression refers to an esthetic approach in which the artist considers sound -- noise or "sound events," as opposed to notes -- as a prime material to create a work of art. Sound art can be the wailing of a tub with strings, the recordings of the variations in the bioelectrical fields of plants, the sound of a microphone "writing" on a metal book, or abstract sound paintings.

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