Hey man, good to hear you liked BP - I'm sure some of the FREDers will come by and drop their thanks at some stage.

But to answer your questions, 3 hasn't been released yet, but the team's working on the next installment,
and I *think* the music is available on the team website here. If you're keen, though, you can take a look through the credits for the mod and you should be able to find the tracks used.
EDIT: Wait no, doesn't look like the tracks are available from the website, so looks like the credits are your best bet. If you have any programs that can play .ogg files, you can take a dig through the BP .vp files in your mod folder and extract the music files and just play them like that.