S4·E21 Semifinals, Group 1
Core
Aired September 1, 2009
Synopsis
The semifinals kick off with the first 10 acts from the Top 20 taking the stage.
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Frequently Asked Questions
When did Season 4 Episode 21 of America's Got Talent air?
Season 4, Episode 21 ('Semifinals, Group 1') originally aired on September 1, 2009.
How long is Season 4 Episode 21 ('Semifinals, Group 1')?
The episode follows the standard broadcast runtime for America's Got Talent.
What happens in America's Got Talent Season 4 Episode 21?
The semifinals kick off with the first 10 acts from the Top 20 taking the stage....