What You Missed Last Night: The Simpsons theme, a cappella

In the closing credits of The Simpsons last night, this video was played instead of the usual closing theme song. It's not new (it was actually recorded in 2000), but it's the first time it was played on the show. It's the singing group Canvas, doing a rather clever a cappella version of the theme. For some reason, I thought the one shown last night was slightly different than this (more of the closing theme than the opening theme), but their web site says this is the one played last night.