Collaborate on a crowd-sourced music app for performing artists

Would anyone like to collaborate on a crowd-sourced music app for performing artists? I’m a designer, but this project would need a developer and a maker as well.

Wouldn’t it be cool if performing artists could set up several instruments (synthesizers, drum machines… etc)  on stage and allow the audience to collaboratively contribute to the song by using their mobile phones as a midi interface? The artist could even select songs from his own device with pre-selected key signatures that would restrict the notes to ones appropriate for each song so that members wouldn’t need a musical background to participate.

There might be a small potential revenue stream on the hardware, allowing an artist to connect a module to instruments, but I think participants would be willing to pay 99¢ for the opportunity to contribute to performance… Potential?