Grigsby auditioned for the second season of American Idol where he sang "Overjoyed" by Stevie Wonder in the first semi-final group and was one of two contestants from the round to automatically advanced to the semi-finals.
In the finals he sang "How Sweet It Is (To Be Loved by You)" by Marvin Gaye and advanced to the top eleven, where he was eliminated after singing "You Can't Win" from The Wiz.