Another popular background music system was sold by Seeburg (the jukebox manufacturer). You bought a Seeburg 1000 Background Music System and then subscribed to a service that mailed you double-sided vinyl records that were stacked into the unit and played back continuously. Records were mailed back at the end of a period.
https://en.wikipedia.org/wiki/Seeburg_1000
There's a streaming website for you to enjoy during your workday: https://seeburg1000.com/