RIVERSIDE (Sept. 9, 2013)—California Baptist University vocal instructor Sarah Horn made a second appearance at the Hollywood Bowl Sunday evening September 8. Horn emceed and helped judge the renowned venue's ABBAFest, a sing-off of a capella groups from Southern California colleges.

Horn first sang at the Hollywood Bowl last month when Kristin Chenoweth called her up on stage on Aug. 23 during a performance to sing For Good from the hit musical Wicked. Chenoweth played the good witch Glinda on Broadway. A video of the duet went viral within days, attracting more than 3 million viewers.

Horn opened the event by singing ABBA's Thank You for the Music, telling the audience to channel their inner "dancing queen", a reference to another hit song by the Swedish quartet. Later, she sang For Good again, this time with backup from the three a capella choirs. Horn received guest billing on the Hollywood Bowl's marquee.

"It's been a whirlwind two weeks, let me tell you," Horn said during the program.

Horn became a media sensation after she sang with Chenoweth, appearing on Inside Edition, Good Morning America, Fox and Friends and news programs across the nation.

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