Why do musicians slave themselves for FREE (or for peanuts) just to get their name in a credit roll? I can tell you after having produced a movie that I could CARE LESS what credits (if any) someone has. There's only 2 things I care about: 1) Is the song what I'm looking for and is the quality up to par, and 2) How cheaply can I license it for? Is it within my budget? Producers find it within their budget to pay studio teachers (required by law when someone under the age of 18 works on the movie) for a bare minimum of $150 to $200 per day. Good production crew people may work for as little as $125 a day, with beginners working for perhaps $75 per day. So when a producers says "We're out of money. We can only pay you copy & credit" why would you stoop so low? Producers are getting away with paying nothing because musicians THINK that having a credit will somehow advance their career. I can tell you that it doesn't make any difference. It's all about the song and the price.