When Kristen Chenoweth called a fan out of the audience to help with a fun duet, she didn’t know the lady was stupendous voice coach.

Sarah Horn is now a YouTube sensation, thanks to the surprise duet August 23 at the Hollywood Bowl.

You’ll get tears in your eyes watching this performance, a song from Wicked with the heartfelt refrain, “Because I knew you, I have been changed for good.”

(WATCH the video below and READ the full story at People.com)

SHARE the awesome moment with your musical pals…

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