Semifinals, Group 1 Results America's Got Talent : Season 4 Episode 22
TV-PG NBC 1h 00m
Aired: September 2nd, 2009 @ 8:00 PM EST on NBC
Four acts are selected to advance to the finals in a results edition. David Hasselhoff performs, as do the Muppets' Kermit the Frog and Miss Piggy.
