The fifthteenth episode of Season 3, and the forty-second episode of America's Got Talent overall, aired on September 10, 2008. It was the second of two Semifinals performance episodes and took place in Hollywood. 10 acts performed for 5 spots in the Finals.
Performed
| Name | Image | Act | Judges' Buzzers |
|---|---|---|---|
| 1. SickStep | 
|
Dance Crew | Piers: 
|
| 2. Donald Braswell | 
|
Opera Singer | Piers:
Sharon: David: |
| 3. Joseph Hall | 
|
Elvis Impersonator | Piers:
Sharon: David: |
| 4. Taubl Family | 
|
Family Orchestra | Piers:
Sharon: David: |
| 5. Sarah Lenore | 
|
Singer | Piers:
Sharon: David: |
| 6. Nuttin' But Stringz | 
|
Hip-Hop Violin Duo | Piers:
Sharon: David: |
| 7. Kaitlyn Maher | 
|
Singer | Piers:
Sharon: David: |
| 8. The Tapping Dads | 
|
Tap Dance Group | Piers:
Sharon: David: |
| 9. Eli Mattson | 
|
Singer and Pianist | Piers:
Sharon: David: |
| 10. Jonathan Burkin | 
|
Baton Twirler | Piers:
Sharon: David: |
Guest Performers
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