via hollywoodreporter.com Plucked from the audience to join the performer on "For Good" from "Wicked," singing teacher Sarah Horn stunned the crowd with a pitch-perfect rendition. That's how many people have now watched Sarah Horn, a Southern California-based singing teacher, duet with Kristin Chenoweth at the Broadway star's Hollywood Bowl engagement Friday night. PHOTOS: 'Glee' 300th Musical Performance Celebration That performance -- a rendition of Wicked's "For Good," in which the two witch sisters of Oz bid each other farewell -- has deservedly gone viral. It was a risky moment of spontaneous dream-making that could easily have tanked, but instead provided the crowd with four minutes of sublime musicality. "The 10,000-plus people of the Bowl faded away," Horn, a vocal teacher at California Baptist University in Riverside, writes of the experience on BroadwayWorld.com. "There was no one else there. No noise. No people. I could hear the beautiful music of the orchestra but there was no one onstage, just Kristin and I." Horn, who sang Elphaba's part to Chenoweth's Glinda, says she has been inundated with praise from well-wishers and work inquiries since the moment she stepped off the stage. STORY: Kristin Chenoweth Joins Matthew Broderick's CBS Comedy Pilot Paul Geller, production director of Hollywood Bowl and Walt Disney Concert Hall, pulled Horn aside to tell her the song was "better than anything they could have planned." And Darren Criss, Chenoweth's co-star on Glee, chanted Horn's name backstage before posing for a photo with her. Horn swears the moment was completely unplanned, despite several queries, including one from the Los Angeles Times, asking if she was in fact a plant. "It was unlike anything I have ever experienced," Horn says.