After searching for a Hexen 64 Music Conversion WAD to no avail, I finally decided to download SLADE 3 and rework the soundtrack into the game's files, since the existing one disappeared off the internet. I played through the first few levels and all seems good! If there's any hiccups in the WAD, PLEASE DO NOT HESITATE TO LET ME KNOW. I will fix whatever problems which may occur. As of the WAD itself, it works on both GZDOOM and Zandronum. Have fun!