Twelve semi-finalists made up of singers, acrobats and variety acts will perform live on America's Got Talent Tuesday night from Radio City Music Hall in New York City.

Here's a preview of the acts that will be performing, with videos provided by clicking on their names.

Angela Hoover:

This comedian/impressionist got through the quarterfinals with America's votes after the judges tied in voting. She performed impressions of judges Heidi Klum, Mel B as well as singer Christina Aguilera. The judges said her material was slightly weak so she'll have to impress Tuesday.

Cami Bradley:

Singing an acoustic version of Believe by Cher, this singer-songwriter touched the judges and America in her quarterfinal performance. She was voted one of the top 3 acts of the week and advanced automatically to the semifinals.

Collins Key:

Performing in the first quarterfinals show, this magician charmed America with his trick involving Twitter hashtags. He was in the top 3 of that week and has been a frontrunner since his original audition.

Duo Resonance:

Klum saved this acrobatic couple after they lost the Judge's Choice in last week's quarterfinals. Since they are wildcard pick, they might have a tough time getting ahead of some of America's favorite acts so they'll have to stand out.

Forte:

Another frontrunner since the beginning of the season, this operatic trio has performed stirring renditions of classic songs like Somewhere from West Side Story. They were in the top 3 of their quarterfinals week and could advance even further Tuesday.

Innovative Force:

This young acrobatic dance troupe performed a dramatic routine to heavy percussion music. Impressing both the judges and America, they were in the top 3 of their week, standing out against many of the dancers of that night.

Jonathan Allen:

This opera singer has also been a favorite since the beginning with his tragic story of being rejected by his parents and his emotional singing voice. After singing The Impossible Dream from The Man of La Mancha, he advanced to the semifinals after being one of the top 3 in his week.

KriStef Brothers:

The only acrobatic act to provide comedy in their routine, this duo shined as a classic variety act in the first quarterfinals week. Performing in cheesy '80s costumes, they were in the top 3 for the week and advanced on America's vote.

Taylor Williamson:

This awkwardly shy comedian used his personality as part of his jokes in his quarterfinals performance. Though the judges were mixed and they tied in the Judge's Choice, it was revealed that he had been no. 4 in the votes, which gave him the opportunity to advance.

Tone the Chiefrocca:

A self-proclaimed one-hit-wonder, this rapper was eliminated by the Judge's Choice in their quarterfinals week. Mel B saved them in last week's results show, choosing him as her wildcard pick.

These are the only acts that have been officially announced to be performing this week, though shadow dance theater group Catapult Entertainment is assumed to be participating as well. The other slot is yet to be known.

Six acts will advance to the top 12 on Wednesday night's results show. America's Got Talent will air the live show Tuesday at 9 p.m. on NBC.

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Americas Got Talent