Context: Guest judges may occasionally be introduced. In season two, guest judges such as Lionel Richie and Robin Gibb were used, and in season three Donna Summer, Quentin Tarantino and some of the mentors also joined as judges to critique the performances in the final rounds. Guest judges were used in the audition rounds for seasons four, six, nine, and fourteen such as Gene Simmons and LL Cool J in season four, Jewel and Olivia Newton-John in season six, Shania Twain in season eight, Neil Patrick Harris, Avril Lavigne and Katy Perry in season nine, and season eight runner-up, Adam Lambert, in season fourteen.

Question: In what season was Lionel Richie a guest judge on American Idol?
Answer: season two

Question: Which season eight contestant was a guest judge in season fourteen?
Answer: Adam Lambert

Question: In what season was Donna Summer a guest judge on American Idol?
Answer: season three

Question: In which season was Shania Twain a guest judge on American Idol?
Answer: season six

Question: Which season of American Idol featured Katy Perry as a guest judge?
Answer: season nine

Question: Who were the guest judges in season two?
Answer: Lionel Richie and Robin Gibb

Question: When was Shania Twain a guest judge for auditions?
Answer: season eight

Question: When did Donna Summer help the contestants during the final rounds?
Answer: season three