I myself don't see how it can really be a griefing tool, if someone goes up to your house and starts playing music, the admins just break the jukebox and disc and/or do whatever they want to with the player. I myself cant see how griefers will use this without getting punished. Also, its not a server wide mod, its only in an area, so people cant spam the server with them without the admins noticing. The mods to share your music with people around you wile playing minecraft but not with everyone, and if you don't like what people are playing just walk away. If they fallow you with it then call an admin. There would not be admins if there job was easy now would there?