Lionel Richie and Luke Bryan discussed newcomer Carrie Underwood's impact on American Idol, praising her knowledge of songs and willingness to help nervous contestants. Underwood shared her approach to evaluating contestants' potential, while Bryan revealed his ability to sense when singers are about to faint. The trio engaged in a fun "Name That Song Challenge" on The Tonight Show, showcasing their musical knowledge and competitive spirit. American Idol airs on Sundays at 8 p.m. ET on ABC.