This is stunningly beautiful classical choral music. Even if that's not your thing, the stories and virtual communities that have formed are, IMHO, awe-inspiring.
Here's the first one:
Then there was a second:
What I think is even better than these two "music videos" is the TedTalk Whitacre gave about making them and what it meant for some people to be a part of the virtual choir community:
Which leaves the third and most recent virtual choir. Check it out: nearly
half of this 11-minute
video is simply the credits of the 3,000 or so contributors to this work. Staggering, really.
Eric Whitacre's Virtual Choir 3 website provides even more background on these projects.