Which career role is concerned with obtaining copyrights for songs or music scores? promotersbooking agentsmusic publishersmanagers

I think this might the music publisher's role. The main focus of the role is to administer,exploit, and collect royalties for its copyright properties. Administer entails the filling of a notice of copyright in the U.S. Copyright in Washington, the issuing of licenses, collecting of royalties, and paying writers and co-publishers their share of the proceeds. Exploitation involves getting artists to record your copyrights, and extends to getting them used in films,television,radio, and TV commercials, etc. 

Its the 3rd one i think

Hey user  he  bachs contributions to the baroque period were bassed of keyed instruments