I am a music licensing administrator (which didn't quite fit in with the choices for occupation) rather than an actual music supervisor. However, my company acts as the licensing department for several composers and publishers both in the U.S., Canada and Europe. We also work with music supervisors and other clients assisting them to obtain the licensing they need for the use of copyrighted music in various projects.
The Harimaya Bridge
Film by CopyCat Music Licensing, LLC Music Licensing & Clearance