I didn't name the original tracks other than their level (e.g., E1M1_Landing). It's pretty basic but it was an easy way for us to keep track of which music went with which level. For me, those names have really become *the names* of the songs.
P.S. Haven't posted here for a long time. Sorry it took so long to see your question. ChexQuest has been on my mind lately as I'm working on updating the music for Chukker's HD remake. It's looking great!