Kristin Chenoweth struck gold when she brought up a member of her Hollywood Bowl audience for a duet: Sarah Horn turned out to be a voice teacher with serious chops.
During Friday's performance, Chenoweth started out doing the heavy lifting on a performance of "For Good" from the musical "Wicked." But once she realized who she was dealing with, she let Horn have at it.
"Oh sing it, sing it," she said, later adding: "Holy crap, harmony!"
A video of the performance has earned more than 2 million views, and counting.