The term 'not in any key' is often used to describe music that is ATONAL. ATONAL music is a type of music that does not conform to any traditional musical scale or key, and instead uses dissonant intervals and chords to create a unique sound. The term 'ATONAL' can also be used to describe a piece of music that does not have a tonal center, meaning that it does not have a single note or chord that serves as the focal point of the piece.