Music add-ons

I was wondering, since you're not allowed to post music wads as purely their own wad, what if you included one with another wad that's not a music wad?

I think that music wads are prohibited cause most of them are full of comercial music. I dunno, I think that you can, but use non-comercial music if you don't want to have any trouble. xD

If you are talking about making a level pack as one WADfile, then compiling music for it in a different WADfile, the answer is yes as long as both files are in the same release. (as far as I know)

People do this often to make their modification netgame hostable (downloading a 22 MB music WAD isn't hostable) version of the mod that doesn't include the music, and then have the music available so you can add it for single player.