If you make a game for Ludum Dare 38 and looking for some chiptune stuff, check my page, there are some free loops, which you can use.
Couple of examples:
- arcade title music: http://www.newgrounds.com/audio/listen/643417
- chasing loop: http://www.newgrounds.com/audio/listen/643432
- soft level loop: http://www.newgrounds.com/audio/listen/740866
Also find a link to my Bandcamp page, there are extra tracks, which you can get for free.