Here's a little trick I just figured out:
The "splash screen" xmi is index 0, corresponding with the file AD00.XMI.
If you rename the other XMI files to AD00.XMI, you can hear the fight music / dungeon level music on the splash screen and the exterior screen. For example, if you want to hear the Tavern theme for the first time since INN Revival was live, all you need to do is rename AD01.XMI to AD00.XMI and... give it a run.
So soothing.
Is someone up to recording the output of dosbox playing these songs as mp3s? You would want to make sure you cut the recording at the exact right moment, because these songs were meant to loop.
Thankfully, the theme on the splash screen ends with the song, so as long as you cut it when the song fades to silence, that should work!
There are a few songs, particularly the variations of the combat themes, that I frankly don't recognize or can't remember. I wonder if some of the songs were never used in the game.