If a business uses ANY music they must pay royalties to BMI, ASCAP and SESAC. Yes ALL three and they do monitor using "mystery shoppers".

Out of curiosity, where does the line of what "uses" is get drawn?
If the wholesale house has a radio on in the morning when customers are getting their orders is that a violation?

If a crew shows up on a rough wire and turns on the DeWalt job radio is that a no-no.

For that matter if I'm on job by myself listening to a broadcast an I doing wrong because I'm there in a commercial capacity? What if other trades are there and can hear it?

It seems a bit silly since anyone I've mentioned can simply tune in for free providing they brought their radio.
The real problem is getting everyone to agree on a station.