Mandy Harvey earned coveted Golden Buzzer, standing ovation and tears on Tuesday's episode
Twelve-year-old 'America's Got Talent' winner recently released debut EP 'Perfectly Imperfect'
Teenage singer also talks Golden Buzzer response from One Direction's Louis Tomlinson, plans for 'AGT' live show
NFL long snapper impressed Ne-Yo with his magic tricks
Twelve-year-old received rare "golden buzzer" reaction from judge Howie Mandel
"There have just been a ton of shows, and something has simply gone awry," Simon Cowell says
Singer beats out Steven Spielberg, Simon Cowell for top spot
Georgia singer stuns judges before getting down on one knee
Singer replaces departing judge Sharon Osbourne
Radio personality on board for next season
Justin Bieber, Green Day and Flo Rida perform on results show
Six finalists paint, prance and perform for the grand prize
Three acts advance to finals, Train gets pitchy on 'Drive By'
Dogs jumping rope, dinosaurs with lightsabers and awkward comedy prevail as finals near
Three acts advance to finals; Neon Trees perform their single