I can't seem to get the jdoom music packs such as dj_redlight_doom_remixes.pk3.zip to work with zdoom. I managed to get the hi-res jdoom texture pack working fine simply by copying them to zdoom/textures. Any ideas?
There's two ways, I think you can do this:
1) Does your music have a MAPINFO? You'll need MAPINFO to play a certain type of music (if you have the music file has a different name than Doom 2) you want for a level.
2) Try renaming your jdoom music files to the same as Doom2 music names.
You don't have to do it with a wad. It's a better idea to do it with a pk3 (zip) file anyway, because it will compress the files. Also, no need for SLumpEd or XWE. See the wiki: Using_ZIPs_as_WAD_replacement
It's possible to do it without renaming the files if you use MAPINFO to explicitly assign the music to maps, but that's your call. If you're just trying to replace the original music, it's sufficient to just rename things.