I tend to listen to Big Bad Wolf or Sick Like Me by In This Moment when I type. Really helps me, can't explain why it just does.
Just discovered this and it isn't going to leave my tab any time soon. Christina Stürmer - Millionen Lichter (Extan Remix)
I've been listening to the Kichikuou Rance version of Ontology for the last week. Even though I think from a musical perspective, the one from Sengoku Rance is superior. The laughter from one of the main antagonists that permeates the Kichikuou version gives it a much more ominous feel.