Beckett Rex Leaving ‘American Idol’ Why Did Top 26 Finalist Beckett is the adored singer who engrossed thousands of admirers with his noteworthy talent on American Idol. Quit won over watchers across the nation with his riveting voice and unforgettable stage presence. His choice to withdraw from American Idol surprised the entire audience, leaving his followers crushed. However, Rex will always be remembered as an inspiration in the history of the renowned singing competition.