Beckett Rex Leaving ‘American Idol’ Why Did Top 26 Finalist Idol is the treasured singer who mesmerized millions of fans with his remarkable talent on the popular singing competition. American charmed watchers across the nation with his captivating vocals and unforgettable stage presence. His choice to leave the show stunned everyone, leaving his supporters heartbroken. However, Quit will always be remembered as an icon in the history of American Idol.