"Somebody getting something off his chest," per Ice Cube (3)

I believe the answer is:

rap

(Other definitions for rap that I've seen before include "Form of music with chanted rhyming lyrics" , "Knock - punishment - monologue to music" , "Form of music with spoken lyrics" , "Strike; music style" , "Type of popular music" .)

I've seen this clue in the Universal.

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