In reply to Sl@te Head: I agree with previous posts, it's best to just post the video and credit the music either on the video or in the description.
I think youtube reserve the right to advertise on your film as some sort of tit for tat compensation....?
I don't see why any artist/record co. would have a problem with their music being used in this way, it's like free advertising. I have purchased several tracks after hearing them on climbing films.
I also use Vimeo now as I find them much more user friendly and they don't put ads over your vid.
Post the link to your vid if you fancy some artistic feedback...