1. Check out YouTube, ReverbNation, Soundcloud etc. for cover artists who don’t write their own songs.
2. Go to open mics to find great singers who don’t write their own songs.
3. Music libraries like Crucial Music.com or MusicSupervisor.com for sync.
4. Sites with sync and other pitch opportunities like Taxi, Broadjam and MusicOpps.
5. To businesses to use your songs in their commercials.
6. Directly to music supervisors to use in the films and TV shows they are working on.
7. To independent filmmakers who need music and don’t have a music supervisor to do the selecting and licensing for them.
8. To up-and-coming artists who are good but not great songwriters.
9. To producers who might want to have a library of originals to pitch to clients who need more songs.
10. To publishers who are looking for artists to develop, not just songs.

The bottom line is this: Wherever you hear music, someone was looking for it and most likely paying for it. Your job is to put yourself in a position to know about and pitch to those opportunities as soon as they arise, A day, or even an hour late can mean the difference between success and failure for that opportunity.