Some of Wim Mertens' tracks on YouTube.
Edited to answer Thaeris:
Currently, I'm piecing a coherent version of "machinebattle" together with Audacity. Should be pretty cool once finished.
Does anyone know the origins of that track, or is it something Darius did entirely by himself? I've been told the sources of BP's music are quite varied.
The "machineamb" tune originates from a track called "The Machine" made by the musician David Arkenstone, for the soundtrack for Westwood's Emperor: Battle for Dune, which was released in 2001. The "machineamb2" and "machinebattle" tunes all come from the "Harkonnen Force" track, also by the same artist.
The game has a few other good tracks in it, like "Victory is Inevitable" (orchestral electro-rock FTW) and "Fight in the Dunes,", the latter by Frank Klepacki, which is a sort of compilation remake of several tunes from Dune 2000 and Dune 2. I really like the dark percussion and orchestral style Frank uses. The soundtrack CD was released as part of a limited-release pre-order set; it might still be available somewhere (like eBay) BUT it does not contain all the game's tracks.