This might be divisive, but I very heartily recommend World of Warcraft soundtracks as background music for playing Torchbearer. I’ve got WotLK, Cata and BC albums. (Wrath and Cata are the better ones – less alien than BC.) I also have the Taverns album, which is great for character creation background music, and for camp phases. Looping a particular city track, such as Silvermoon or Dalaran, works great for town phases.
Example of a good one for dungeon delving:
The Skyrim sountrack is also okay, but is way too specific sounding – stylistically, I guess? – to be really appropriate.
Anyhoo.