^Two awesome sites::
  http://dig.ccmixter.org/music_for_film_and_video - they have
  other types of music too. The music is completely free to use
  for anything, so if you make videos and worry about copyright
  and stuff, this will work for you.

  And....

  http://www.freesound.org/ - where you can use and share SOUND
  CLIPS for free, no copyright, none of that stuff.

  This one is exciting to me because I have ALL THIS MUSIC but I
  don't wanna perform any of it, or mix songs and crap, but I want
  my stupid talent to be useful for something. So at least I can
  upload the little musical bits and maybe someone can mix it into
  their songs or whatever.

  I finally found a reason to bother splitting my music up into
  clips. I could never do it for myself - the editing process is
  just too boring for me. Same reason I can't write music, just
  make it. "writing down" music is boring.^