Katy Perry joked that an overexcited contestant might start a 'mosh pit' with Ryan Seacrest on Sunday during American Idol's selection of its Top 16. Colin Jamieson, a 22-year-old wedding singer from Boxford, Massachusetts, was his usual ebullient self during the ABC show that cut eight remaining contestants. While performing Everybody Wants To Rule The World by Tears For Fears, the former boy-band singer worked the stage and its cameras like a pro. Mosh pit: Katy Perry joked that an overexcited contestant might start a 'mosh pit' with Ryan Seacrest on Sunday during American Idol's selection of its Top 16 Katy, 36, and the other judges praised Colin's performance, which showed off his pipes, too.