America's Got Talent aired its fourth live performance show of the season Tuesday night, featuring 12 of the 60 quarterfinalists competing for four slots in the semifinals.

Here are the highlights from Tuesday night's performance show.

Timber Brown:

This acrobatic pole dancer performed on a wire replica of the planet Saturn, spinning rapidly without a safety net beneath him. Judge Heidi Klum said that he deserved to have his own show in Las Vegas, while Howie Mandel said Brown had one of the best performances of the night.

Cami Bradley:

An introverted performer, Bradley sang an acoustic version of Believe by Cher, while playing the piano. Stern said that Bradley was definitely going to be sent through to the semifinals. Mandel added that she was a star in the making.

Aerial Ice:

This group of acrobatic ice skaters performed an elaborate routine to No Light, No Light by Florence + the Machine. Stern said the group stepped it up for the live show and commended their success, noting the level of difficulty in their performance.

Taylor Williamson:

Utilizing his awkward style of comedy, Williamson got a standing ovation after he performed a standup routine about things he's learned while living in New York City. Mandel said that his personality shined through and Stern said that "the ladies" voting at home would like him.

David Ferman:

This young daredevil juggled three balls on fire, while suspended upside down above a flaming pit. Judge Mel B said that his performance was dangerous and she enjoyed it. The judges all agreed that his tricks were amazing, but Mandel said Ferman had to work on his showmanship.

America's Got Talent will air the results of Tuesday's show at 9 p.m. on Wednesday on NBC. The top 3 acts with the most votes will automatically be sent through to the semifinals and the judges will choose which of the fourth and fifth place acts will make it to the next roudn. 

Watch more highlights from Tuesday night's show here.