Sorry to bump a topic from 2009, but from my perspective it seems that not all of the music was made by DMA-SC and Trash 80. In fact it seems at least one track is by Blazier/TSL.
The evidence comes from this Darwinia bootloader:https://www.youtube.com/watch?v=mXsdgicG_Ws
During that bootloader a track plays which I have not heard elsewhere in the game. However, by chance I also heard the same song on this marathon compendium of Amiga cracktros:https://www.youtube.com/watch?v=50WWFEBsgfk
(Can be heard from 18:14 onwards).
Now according to that cracktro (which predates Darwinia by at least a decade by my calculations) the music for that cracktro was provided by "Blazier Of TSL". Upon doing some digging, Blazier Of TSL wrote the music for Amiga games Benefactor and the Pinball Dreams trilogy back then too.
It is entirely possible that DMA-SC or Trash 80 used to be known as "Blazier of TSL" years ago, but I could not find any evidence to support this.