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"America's Got Talent": Four acts move forward

Nick Cannon, Olate Dogs on "America's Got Talent," July 25, 2012 NBC/Virginia Sherwood

(CBS News) Competition was stiff this week on "America's Got Talent," as four acts advanced to the next round.

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On Wednesday - a day after an impressive performance episode - viewers chose three acts to advance. The first? Canine act Olate Dogs.

Sand artist Joe Castillo and string musician William Close were the next acts to make it through.

Finally, it was up to the judges to choose the fourth act to advance to the semifinals. It came down to dancer Lindsey Norton, cloggers All That! and mind reader Eric Dittelman. In the end, Dittleman advanced, but there's still a chance for All That!, as judge Sharon Osbourne wants to have the group all-male group back for the wild-card round.

The evening also saw performances by singer Cher Lloyd and the cast of the Tony award-winning musical "Once."

Justin Bieber, meanwhile, told fans that a teaser clip for his new single, "As Long As You Love Me," would air during the show, but it never did, prompting the pop star to tweet:

"America's Got Talent" fans will have to wait a couple of weeks for the next round of episodes, as NBC will be airing the Olympics. When "America's Got Talent" returns next month, the series will feature a new round of contestants from YouTube submissions.