American Idol employs a panel of vocal judges who critique the contestants' performances. The original judges, for the first through eighth seasons, were record producer and music manager Randy Jackson, singer and choreographer Paula Abdul, and music executive and manager Simon Cowell. The judging panel for the last three seasons on Fox consisted of singers Keith Urban, Jennifer Lopez, and Harry Connick, Jr. The sixteenth season brought three new judges: singers Lionel Richie, Katy Perry, and Luke Bryan. The first season was hosted by radio personality Ryan Seacrest and comedian Brian Dunkleman, but Seacrest remained as the sole master of ceremonies for the rest of the series. The success of American Idol has been described as "unparalleled in broadcasting history". A rival TV executive said the series was "the most impactful show in the history of television". It became a recognized springboard for launching the career of many artists as bona fide stars. According to Billboard magazine, in its first ten years, "Idol has spawned 345 Billboard chart-toppers and a platoon of pop idols, including Kelly Clarkson, Carrie Underwood, Chris Daughtry, Fantasia, Ruben Studdard, Jennifer Hudson, Clay Aiken, Adam Lambert, and Jordin Sparks while remaining a TV ratings juggernaut. "