One of my colleagues at work used to sing in one of the big Wellington choirs, and has always enjoyed big choirs and the sound they make. He says he 'has a love affair with the human voice.' He's in hospital just now but when he comes out I'm going to alert him to Eric Whitacre's virtual choir. I know I'm slow in catching up on this, and the only reason I came across it was because the Concert programme's competition this week has a prize of one of Whitacre's CDs, and they mentioned it in passing.
Here's Whitacre conducting his virtual, but definitely live, choir: 185 voices from 12 countries all apparently singing together. I'm not sure how this is done, because the intro talks about '243 tracks' as well - does that mean he actually conducted each singer separately? Seems unlikely. But then, so does getting 185 internet connections to function perfectly together! [You can actually see how it was put together in the link under Whitacre's name above...]