photo - Air Force Academy's a capella group, In The Stairwell, performed on the semifinals of "America's Got Talent" Tuesday night. (Screenshot from YouTube video)
Air Force Academy's a capella group, In The Stairwell, performed on the semifinals of "America's Got Talent" Tuesday night. (Screenshot from YouTube video) 

In The Stairwell, the Air Force Academy a capella group, performed Ed Sheeran's hit "Castle On The Hill" on the semifinals of NBC's "America's Got Talent" Tuesday night.

Click here to vote to send the group to the finals. Voting ends at 5 a.m. Wednesday. 

Results will be announced Wednesday night.

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