Usher is playing a big show in London next week, and he wants you to join him onstage. Kind of. Concert sponsor American Express has set up a website where anyone can choreograph a dance sequence using an avatar. Submit the sequence, and it could be chosen for display during the concert, marked with your name and city, Mashable reports. The avatar's gender, moves, colors, speed, and more are under the user's control. "Everybody wants to be part of the show and now they can," says director Hamish Hamilton. The Monday concert will be live-streamed on YouTube.