((looking that should be....))
It won't let me post in general discussion, so I will have to post it here. I found a video of a quest in which the track plays. It's the suspenseful music that starts to play around 56:25 in this video. https://www.youtube.com/watch?v=yRj4lSdCdz0 Note: Level 20 Rogue quest spoilers!
If someone knows, an answer would be greatly appreciated.