I might be skirting a forum rule or two, this post is THAT juicy, the title? What Music Supervisors Wish You Knew
Let no one ever ask again if LinkedIn is worthwhile, heh.

* for cryin' out loud, don't go indiscriminately spamming the good folks mentioned in the post; do not contact them directly, it's career suicide to send them music AT ALL, until they ask you to do so.