Howard, Heidi, Mel and Howie ask these contestants to perform again because they are unsure whether or not they can handle Radio City Music Hall! » Get The America's Got Talent App: http://bit.ly/AGTAppDownload » Subscribe for More: http://bit.ly/AGTSub » Watch America's Got Talent Tuesdays & Wednesdays 8/7c on NBC! » Watch Full Episodes Free: http://bit.ly/AGTFullEpisodes AMERICA'S GOT TALENT ON SOCIAL Like AGT: https://www.facebook.com/agt Follow AGT: https://twitter.com/agt AGT Tumblr: http://nbcagt.tumblr.com/ AGT Instagram: http://instagram.com/agt In season 8, NBC’s America’s Got Talent follows Howard Stern, Heidi Klum, Mel B, Howie Mandel, and host Nick Cannon in their talent search, showcasing unique performers from across the country. Find America's Got Talent trailers, full episode highlights, previews, promos, clips, and digital exclusives here. NBC ON SOCIAL Like NBC: http://Facebook.com/NBC Follow NBC: http://Twitter.com/NBC NBC Tumbl...