Muzak wasn't ever intended to be listened to--it was really meant to cover up distracting background noises--the music was produced so that it never would distract, and would have a generally pleasing and mindnumbing quality. There are all different kinds of Muzak, each especially designed to create a soothing background in a particular situation--I once worked at a manufacturing plant that subscribed to the "Happy Factory" Muzak tapes--