It's actually pretty simple. Are you playing licensed music for the general public? Playing, meaning that you have a speaker system that is constantly piping out background music. If so, you may be subject to licensing fees. If you own a bar, restaurant, retail store, etc. make it your business to pay the royalties (if even possible). In some cases you may need special accounts and hardware. If you are a commercial site that is of smaller stature and you are playing background music, you should check with legal and have them read the ASCAP / BMI disclosures and see if you fit the bill. If you are selling SONOS systems or some other streamer service it is not the same thing as entertaining customers with background music.