Singer Kristin Chenoweth shared the stage with a member of the audience in Los Angeles on Friday night (23Aug13), and was blown away when the fan unveiled an amazing vocal talent. The star regularly invites revellers up on stage at her shows for a singalong, and she grabbed one devotee at her concert at the Hollywood Bowl in California. She began singing Ford Good, a duet from her hit musical Wicked, before her unknown collaborator Sarah Horn took to the mic - and stunned the audience with her powerful singing voice. Chenoweth gawped at the audience in shock as Horn sang her section of the song, shouting, "Oh sing it, sing it!" They then joined together for the end of the duet, with the Glee performer exclaiming, "Holy c**p, harmony!" It turned out Horn was a vocal teacher. She said after the set, "This is a night I'll never forget."