From With Loudcrowd, Nabeel Hyatt Sees Mult-Billion-Dollar Opportunity in Music Gaming: “This Thing Is Ours to Screw Up”:

Dance screen from Loudcrowd
Dance screen from Loudcrowd

In the game Dance, users attempt to strike directional keys at the right moment, with their performance later translated into an avatar’s dance moves in a videos they can share with other users.