There is no references for the music in the documentation for HUv1.21. Soulmancer would be the one to know this information, but he added the music to HU almost a decade ago, and perhaps it was from a poorly documented source.
The best references I've found on the forum are from you already, so thank you for pursuing this information as well as you have:
http://forum.arimyth.com/viewtopic.php?f=8&t=6626http://forum.arimyth.com/viewtopic.php?f=8&t=5798If anyone relatively new to HU recognizes more of the sources for HU's music, it would be great to get their sources figured out and added to some documentation.
I suppose someone could try using some
music-search tool to figure out the tracks. If folks construct a list of the music they want identified, I might eventually get around to doing this myself, but for now I'm not sure where to start and it's a potentially long list.