Back in the day we used to key the mic whenever the local radio station was playing the theme from “Hill Street Blues”.
Gave the dispatchers a chuckle.
Never tried it through the PA speaker, though.
Back in my day, I used to broadcast bluegrass music (once in a while) through my phone into the intercom, over a 10 acre staging area at the steel plant where I worked. My shipping manager tells me that the truckers loved it. Oh, and it was in Detroit.
One of the engineers at the railroad I am at keys the mic when his phone would go off in the cab... His ringtone?
Casey Jones, by the Greatful Dead.
Always cracks me up to hear it on the base station radio... randomly while the crew is drilling the yard.