I'm a broadcaster with Live365 and they have a blanket license
agreement with ASCAP, BMI, SESAC and Sound Exchange for all their
stations. (They send our fees to those agencies for us.)
However, I have no experience with Sound Exchange from the musicians'
perspective and don't know how you would go about collecting royalities
due you. I would like to think the money we pay to be a legal broadcast
ends up in a musicians' pocket.