Best places for royalty-free music for a video?

[Freycinet]

Hi all,

I'll need some audio for my next video, where are the good places to get music which won't be blocked by youtube for copyright reasons?

I found http://incompetech.com/music/royalty-free/ where there is a very nice collection. Anywhere else?

It seems youtube itself also has a collection I can use, but does it mean my video will be plastered by ads? I also see some movies with a link to iTunes to download the music, but how does that work? How do I create a link like that?

Thanks for any help!