It may kinda defeat the purpose of a DJ, but a group of UCLA researchers seem to think their new "Smart Party" WiFi music polling system provides an adequate substitute, and that detailed diagram above is certainly hard to argue with. As you may or may not be able to discern form that, the system relies on software to poll the music stored on each person's WiFi-enabled music device (just laptops in its current form), in turn creating a playlist based on the most popular tracks or music genres. It also keeps track of people coming and going, with it constantly ditching and adding users' preferences in order cater to those still at the party. Not surprisingly, there's still a few problems they need to overcome, including a little thing called DRM, which could be quite the hurdle given that the system must first temporally copy the tracks before playing 'em.

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Researchers devise WiFi music polling system for DJing by consensus