Famous singers have pulled members of the audience on stage with them in the past - but it's not often they get out-sung.
There aren't many people who can hold note to Broadway star Kristin Chenoweth, but at a concert at the Hollywood Bowl in Los Angeles over the weekend, one vocal coach almost rendered the Emmy and Tony-winning actress speechless.
In the second half of her show, Chenoweth asked a few audience members if they knew the song For Good, from the acclaimed musical Wicked, in which she played the good witch Glinda.
Sarah Horn put her hand up and was invited to come on stage and sing it with her. Before the pair started their duet, she told Chenoweth she was a vocal coach.
When they began singing, Chenoweth took the lead and playfully told Horn that it was still her part. When Horn finally opened her mouth, Chenoweth's jaw dropped along with everyone else's in the auditorium.
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