For those of you who don't know, "neatsong" is the official Build Engine theme song! Well, not really - although it would be a good candidate if I was ever to declare such a thing. Actually, it's the default song that you hear when you enable music in KenBuild.
I composed NEATSONG.KDM in either late 1994 or early 1995. I don't know when exactly, but I do remember writing it at the 3D Realms office. It's one of the few songs that I wrote without the help of an external MIDI keyboard. Around that time, I was integrating KDM into Build and this was to be my cool, new default song to use in my test game. I'm sure 3DR would have loved to have digital music in their games - since Epic had it in Jill of the Jungle and Jazz Jackrabbit. For whatever reason, KDM never caught on.
P.S. NEATSONG.OGG (included with JFBuild) isn't very good quality. If you want full quality, extract NEATSONG.KDM and WAVES.KWV from STUFF.DAT in KenBuild (using KEXTRACT), and then you can play it using my Winamp plugin: IN_KEN.DLL