I found some interesting (campaign map) music on Jamendo:
http://www.jamendo.com/en/album/70362
http://www.jamendo.com/en/album/67605
http://www.jamendo.com/en/album/34240
The artists are using a copyleft license for their works so that is a bonus I guess. They ask sharers to give them credits (the artist name is enough AFAIK, which can easily be put in the file names/metadata). So that should not be a big deal.