U.S. Performing Rights Organizations (PRO's)
Imagine running around to every restaurant, nightclub, hotel, retail store, bowling alley, mall, radio and TV station, and everywhere else where music is played to negotiate contracts to have your music played and then following up to track usage and collect payments?! Whew! It's tiring just thinking about it. That's what Performing Rights Organizations do, so consider joining one unless you want to do all the work yourself.
You can find a list of global Copyright collection societies at the link here