I asked for a choir in the youtube video a long time ago, and now it's happening. You have no idea how happy I am to see this. The music of EF has come so far, and the pieces we have now are brilliant. I can't wait to see how beautiful they will be with a choir.
I do have some basic musical and russian skills, so I'd be happy to help out if something comes up, but it seems to me that people who truly know what they're talking about have got this handled.