A live performance of Brian and his band playing Vegetables from the album SMiLE.
What amazed me with this performance is that Brian actually hits the high notes himself. It's not as great as in his 20's, but it shows he can still pull off a very decent falsetto when he wants to.
The performance of Good Vibration from this same concert has him hitting the high falsetto notes too.

If you like this video, buy the DVD of the whole concert. It really is an amazing performance of a great album, and with Brian's great mood during the whole thing, it's impossible not to be happy while watching it.