Foster said his life has changed since being a contestant on the show. “It has just been like rocket fuel to my career to be on American Idol,” he said. “I went from 0 to 50

After, Foster took the stage to perform six songs for a large crowd of eager listeners — many of which he covered on the show. First, he sang "Don’t Rock the Jukebox" by Alan Jackson, followed quickly by Elvis classic “Jailhouse Rock."

Judge and former "Idol" winner Underwood offered George Strait's "I Cross My Heart" for Foster to sing during the show's "Judges' Choice" night. Foster went with Underwood's pick, one of three songs the judges chose for the finalist to perform.