Musicians For Your Song
This is a group of great musicians that will add a solo track or instrumental track to your song. They also have access to arrangers, and producers. If you need anything to help you with a song, contact Musicians For Your Song.

HouseOfTunes.com
This is a social networking site for musicians. It offers each musician a place for their music and/or albums. You can upload photos, videos, show dates, blog entries and even create a billboard. Registered listeners can rate the musician's music. and videos. This site is run by a group of actively working Los Angeles musicians who know the business.

MusicAndSoundFX.com
This company accepts submissions from musicians and places them in a library This library is available to businesses internationally.

Online Music Institute
This organization has acquired the services of a group of highly talented musicians to give coachings on a wide variety of instruments. They also provide tutoring and lectures on other musical subjects including theory, orchestration and writing for film. Contact these guys if you want to beef up your skills or learn something new.

Ray Stein Media
This musician had his site set up not too long ago. He is editing and enhancing it himself. We'll see how he does.