The term 'KIND OF SHEET OR MUSIC' can be answered with the 3-letter word 'RAP'. RAP is a genre of music that originated in the United States in the 1970s. It is characterized by its use of rhyming lyrics and spoken word delivery, often accompanied by a beat. RAP has become one of the most popular genres of music in the world, with artists like Eminem, Jay-Z, and Drake becoming household names. RAP is also used to describe a type of sheet music, which is a form of notation used to record and communicate musical ideas.