Greetings,
I have finished something (related to Unity), and I am looking for a few sounds. Does someone has any website giving free FX sounds and/or music that can be employed in games ? Jamendo offers musics but it is hard (next to impossible) to use them as BGM…
Check out freesounds.org
That’s another great source for music. Royalty free too. ^^
soundsnap.com its awesome.
Newgrounds.com is also a great site I’d say.
I will check all your links. Thanks you, everyone ! 
There is a huge post about it on UnityAnswers, check it out:
http://answers.unity3d.com/questions/225/where-can-i-find-music-or-sound-effects-for-my-games