It became the first non-winning contestant to have a Billboard Hot 100 number-one.
Clark also alleged that Abdul gave him preferential treatment on the show and tips on song choice.
It was the first season to crown a male winner, and the first season to have a finale with two male contestants, Studdard and.
From each group, two were selected to proceed on to the top 12, and those selected reprised their performance in the result show.
There were no live audience although family members of contestants were present in the Red Room where the contestants were placed.
Nine of those who failed at any of previous stages including the Hollywood rounds and the initial regional auditions were given one more chance to perform again in the wild-card show.