Adam Lambert performed `` Mad World '' in the episode of American Idol season 8 that was broadcasted on April 7 .
On the April 8 ( Top 8 ) performance episode , Idol ran nearly eight minutes past its set ending time , such that viewers who recorded the program on digital video recorders completely missed the final performance , Adam Lambert 's performance of `` Mad World '' which received a standing ovation from judge Simon Cowell .