I'm sure that many of you have heard of Eric Whitacre, composer and conductor. One interesting project that he's been working on recently is a "virtual choir," wherein individuals submit videos/recordings from around the world that are then combined into a single choral "performance." So far, he has put together recordings of a couple pieces, the most recent being Lux Aurumque, which now has over 600,000 viewings on YouTube. On his website, he states,

My ultimate goal is to write an original piece for the Virtual Choir and have it receive it’s world premiere in cyber-space, hundreds (maybe thousands) of people singing alone, together.

You can read about the virtual choir and check out his videos here.

(While it's an interesting project, I suspect that most of us would agree that the reward from performing virtually would pale in comparison to that from participating in a live performance.)