There was a music chatroom a few years back (turntable.fm) that was trying to do this. You had 2+ DJ slots in each chatroom, and they would take turns picking t

There was a music chatroom a few years back (turntable.fm) that was trying to do this. You had 2+ DJ slots in each chatroom, and they would take turns picking the next song, and the participants in the room could update/downvote their picks. It was great. The DJs would generally be good at sensing when the mood of the room needed a switch up, so you could generally stay in a single room the whole day and never feel bored with the music. I guess they shutdown because they couldn't figure out how to license the music the DJs were playing.