I don't know anything about composing music, but the musicians here could organize under a particular hash tag and communicate with each other to figure it out.
OK but it sounds like this whole project in itself would be a big logistical issue. It might be a bit early for something like this.
As to getting Whitacre involved. If he's using steemit for his communication with the musicians and vocalists, that's how he'd get paid. Someone would have to convince him that the cutting-edge nature of the project, the potential for another viral video, and the rewards he'd earn from steemit would be worth his time.
To be fair that isn't really a fleshed out idea though. I could say it would be great to get any celebrity on Steemit but without some kind of plan to do it or some kind of access to them it doesn't really help.
I would love to get some great film directors like Ridley Scott on but I don't know how I could do it as I don't know him.
It would be a big logistical issue. Just like an open source software release, which is basically what I'm suggesting, just for music instead of software. But it would demonstrate steemit's potential, not as a technology, but as a global community.
I don't actually see Whitacre as being critical to success. It would be nice to have him because he's already done something similar, but what's important is to highlight the community, not the celebrity. You're right, it might be too early, or launching a project like this might attract the talent it needs. There's no way to tell without trying it.
Announce the purpose and let the people organize themselves and prepare to be amazed (or disappointed. ; -).
Yes that makes more sense:)