the music so transmitted, variously regarded as unobtrusive but pervasive, bland and monotonous, etc.
used for recorded music that is played in public buildings or rooms (such as stores or offices)
Muzak is background music played in stores, over phones on hold, etc. The term is also used to refer to various forms of popular music such as rock, pop, and rap, implying (correctly) that they are simplistic, crude, and lacking in artistic merit.