I think he meant this: what's the difference betweeen iPod night, and bringing a CD-R with 4 or 5 songs you've burned and allowing the bar to play it over their PA system?
Answer: musically, nothing is different. People will get their songs played and feel the thrill of being a DJ for 12 minutes (although you don't have to worry about mixing, crowd reaction, taking requests, etc.)
Whatever.