Free Royalty Free music for YouTube videos

Most of my videos have soundtracks and to avoid copyright conflicts I have searched for royalty free music. So far I've used three sites. All these sites have free music which you are allowed to use for personal or commercial purposes as long as you provide credits or a donation.

1. Incompetech. I've used this one the most. It has a lot of high quality songs very suitable for soundtracks. The tracks are also really well sorted in different genres and moods.
2. Danosongs. Quite a big list and good quality, though I've found many of them unsuitable as background music.
3. music4yourvids. A small list but with a few really good tracks. It lacks streaming samples though.
4. dig.ccmixter.org. Really extensive collection though it's a bit hard to find what you want. But sure a site I'm gonna be paying attention to and try to get good track from.

I always try my best to find music that's fitting to the mods I showcase, hope you appreciate it :)