You need to locate the workshop folder inside the gameroot of Duke 3d folder open that and it will say maps, open that and you will see numbered files. The numbers are the maps id number. Find the file id number in this case my map is # 304236490 or try searching the name of the map in search bar . open the zip take out the .ogg file and place it into gameroot/music/usermaps folder. You will want to hear the music on this one