Elevator music, also known as lift music (in the Commonwealth), pipe music or muzak, refers to the gentle instrumental arrangements of popular music designed for playing in shopping malls, grocery stores, department stores, public toilets, telephone systems (while the caller is on hold), cruise ships, airports, doctors' and dentists' offices and, of course, elevators. The term is also frequently applied as a generic (and often derogatory) term for any form of Easy Listening, smooth jazz, or MOR music, or to the type of recordings once commonly heard on "beautiful music" radio stations.