An idea came to me while I was playing:

It would be great to have a NPC in the game that you could talk to, to change the music to a streamed playlist on e.g. http://www.jamendo.com/.
Maybe some hand picked Creative Commons songs that sounds like Folk-song or Mediaeval..
I think that would be a great complement to the standard BGM.
With Open Source and Creative Commons this is all possible, in contrast to a proprietary game which would not be able to use a "Non commercial" license.

What do you think? Too much strain on the bandwidth?

/Peter