Crowdsource the DJ!

What if - at a party or restaurant - the guests can take control over the music being played by suggesting and voting up-and-down?
http://laughingsquid.com/tunetug-social-dj-app-allows-users-to-vote-on-group-music-choices/
http://hyperallergic.com/47719/new-app-lets-you-crowdsource-the-dj/