The music licensing that we provide from the PRO's effectively covers the majority of popular music.
We do understand that there are some artists or record labels who have yet to affiliate themselves with one of the PRO's. It might be in their best interest to do so if they are interested in being having their material covered by what these groups offer.
You can search the databases of ASCAP, BMI, SESAC, GMR, AllTrack, SOCAN, Re:Sound, PPL, and PRS in order to find which Performance Rights Organization was representing the performance side of the licensing for the track.