Weezer, the pop/rock band behind hits such as 'Say It Ain't So,' includes, from left, bassist Scott Shriner, drummer Pat Wilson, guitarist Brian Bell, and guitarist/singer Rivers Cuomo.

"I've literally never been cool in my life until now," exclaimed Kelly Clarkson after performing Weezer's signature 1994 hit "Say It Ain't So" with Rivers Cuomo and Patrick Wilson during the ...