Finding an actual playable version of the original is proving difficult. Therefore, if you're truly interested (or just dont know/remember how it goes) you can download the midi files for the music . In the package will be a few files. then one you want is titled "Descent".
This is a remix of the MIDI menu music for Descent 2.
Yet Unnamed
I was inspired to do this up when I heard that Interplay is (might be) doing sequels with it's reopened development studio. It's not done, but this is the meat of it. I figure on getting some feedback here while I iron out the issues that I am familiar with. But hey, feel free to point out all the failure you yourself feel exists ;]