Elevator music (also known as Muzak, piped music, or lift music) refers to a type of popular music, usually instrumental, that is commonly played through speakers in elevators, shopping malls, grocery stores, department stores, telephone systems (while the caller is on hold), cruise ships, airliners (during flight after taking off), hotels, airports, business offices, restaurants, bars, hospitals, as well as electronic program guides, weather forecasts, television testcards, and some arcade game venues.