Murphy also booked a gig to perform at Caesars Palace in Las Vegas as part of the prize.
The other finalists were teen rockers PopLyfe, dancers Team iLuminate and shadow dancers The Silhouettes.
The season finale featured performances by the finalists, as well as professional artists Stevie Wonder, Patti LaBelle, LeAnn Rimes, Cobra Starship with Sabi and OneRepublic, Tony Bennett with Queen Latifah, Jackie Evancho, Def Leppard and Cirque du Soleil.
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NBC reportedly holds celebs hostage to Jimmy Fallon's show