What's the best custom music in a Descent (II) level?

[kakhome1]

What are your personal favorite custom music tracks (maybe top 3-5) you've ever heard in a Descent or Descent II level (mission and level number)? The only limitation is that it cannot be a track that appears in the original Descent I or II. And it has to be a single player mission. Other than that, anything is fair game and it may or may not be something that was specifically composed specifically for the mission.

[Alter-Fox]

Most of them.
Any list would make me look like a midi music dork. Plus I gotta wait till after Xfing puts out the demo for Descent 1.5...