<P> The following acts performed on Wednesday, September 12 . </P> <P> Guests: Justin Bieber, Big Sean, Green Day, Joan Rivers, OneRepublic, Ne - Yo, Flo Rida, Frankie J, Blue Man Group, Burton Crane </P> <Table> <Tr> <Th> Act </Th> <Th> Order </Th> <Th> Performance description </Th> <Th> Result </Th> </Tr> <Tr> <Th> David Garibaldi and His CMYK's </Th> <Td> </Td> <Td> The performance painters painted a portrait of Albert Einstein on a rotating canvas to "Won't Get Fooled Again"; additionally, the CMYK's painted the first letters of the colors they represent (cyan, magenta, yellow, and key black) on their own separate respective colored canvases </Td> <Td> 4th place </Td> </Tr> <Tr> <Th> Tom Cotter </Th> <Td> </Td> <Td> The comedian had host Nick Cannon roll a large plush die with various subjects on each side; landing on "Poor Examples", he then performed a rapid - fire comedic routine about poor examples for children in classic children's literature </Td> <Td> Runner - up </Td> </Tr> <Tr> <Th> The Untouchables </Th> <Td> </Td> <Td> The dance troupe performed a Jive routine to "Proud Mary" by Tina Turner </Td> <Td> 6th place </Td> </Tr> <Tr> <Th> Joe Castillo </Th> <Td> </Td> <Td> The sand artist drew host Cannon and judges Mandel, Osbourne, and Stern in the sand as a tribute to the show, with a live band performing the music </Td> <Td> 5th place </Td> </Tr> <Tr> <Th> William Close </Th> <Td> 5 </Td> <Td> The "Earth harpist" and instrument builder performed two re-orchestrated versions of "Pachelbel's Canon" and "America the Beautiful" with his Earth Harp Collective </Td> <Td> 3rd place </Td> </Tr> <Tr> <Th> Olate Dogs </Th> <Td> 6 </Td> <Td> The dog trick act performed to "Hey Pachuco" by Royal Crown Revue, with a series of tricks including riding in a toy SUV, walking and jumping over hurdles on their hind legs, tumbling, walking on a wheel that was being pushed by another dog, backflips, and finally, two dogs walking wheelbarrow - style over the judges' table </Td> <Td> Winner </Td> </Tr> </Table> <Tr> <Th> Act </Th> <Th> Order </Th> <Th> Performance description </Th> <Th> Result </Th> </Tr>

Who won the 2012 america's got talent