I play Dungeons and Dragons, and I use Nox Arcana as mood music for various parts in the game.  I have different playlists made for different things.  All the intense, fast music I use for combat, the "exotic" music (like Forgotten Path from Grimm Tales, Gypsy Caravan from Transylvania, and Gifts of the Magi from Winter's Eve) for unusual role-playing encounter.  The quieter, more haunted laments (like some of the music from Shadows of the Raven for example) I use for exploration, while the creepier mood tracks (like Crone's Cavern or Freaks) I use to make my players uneasy.  Nox Arcana works wonders for making my game better!