Yes, I will be posting music...mostly smooth jazz...on the Canteen. We just sort of jump in when we get the chance. I am sure that the ones taking requests want to let the others know when they'll be there.
You do need to be a DJ or have access to a music server. Some that post aren't "official" DJs but they want to post, so just jump in. Just need a warning if there are explicit lyrics, though, because families listen. I think the more the merrier as far as entertaining our troops is concerned.
I usually wait till about the 2nd page of the thread to start if I get there early, so I can visit for a while. It's very hard to keep up with pings once I start posting the music. It's very fast-paced. Then after I start really getting tired I just shut down for the evening and talk some more. It's lots of fun and very uplifting to know we are entertaining the troops and they really DO listen to the music!