Following the most viewed season in five years, the 12th installment of the top-rated summer competition series will feature host Tyra Banks, and a quartet of opinionated and insightful judges: model Heidi Klum, TV host Howie Mandel, recording artist Mel B and executive producer Simon Cowell. In auditions across the country, performers and groups of all kinds -- including singers, comics, magicians and contortionists -- present their acts, hoping to make it to the next round of the competition and ultimately be named the winner. The competition takes place in Los Angeles, with live shows from the famed Dolby Theatre.