One of the mysteries of the English language finally explained.
Continuous light music played to workers, especially in a factory; a radio broadcast of such music.
1950s; earliest use found in John Betjeman (1906–1984), poet, writer, and broadcaster. From the title of a radio programme Music while you work from music + while + you [adjective, noun] + work.
music while you work/ˌmjuːzɪk wʌɪl juː ˈwəːk/
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