I was watching a clip of the guys singing Tequila Sunrise on CNN back in 1999 and I swore I thought I saw Will in the back on the keys.
I wonder if Will was part of the backing band during the Millennium show before he was part of Don's backing band in a year later?
Here's the video. His face is kinda blurry, but it looks like him.
http://www.youtube.com/watch?v=ajbhtiWi0b8