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During a pre-show makeup session in her dressing room, "AGT" judge Howie Mandel explained the performer's pressure, the crew's accuracy on the day of a live show.
Dan MacMedan, USA TODAY

This is the moment everyone is waiting for: Here are the live shows!

The episode of "America's Got Talent" kicked off the first quarterfinal round, broadcasting live from Dolby's Hollywood Theater. This means that it can happen.

Only seven out of 12 acts will advance to the September semifinals, adding more pressure for the remaining wow America contests. And the competition is tough. Tuesday's field included three Golden Buzzer winners – Kodi Lee, Sophie Pecora and Luke Islam – and wildcard Ansley Burns, who returned after her torn elimination with Judge Cuts.

Living to this day, is not an issue for Lee, who judges Gabrielle Union said she "changed the world" during her audition and did the same Tuesday.

& # 39; AGT & # 39; goes live: The best move to the final round of the summer's top show

More: & # 39; America & # 39; s Got Talent & # 39 ;: Wildcard Ansley Burns earns a standing ovation for his return

Lee, a blind singer with autism, performed a powerful rendition of "Bridge Over Troubled Water "by Simon and Garfunkel," showcasing his range of voice and amazing piano skills.

Simon Cowell tells Paul Simon special OK'd Lee to perform the song "because he saw your audition, "which has over 42 million views on YouTube.

" I would like to thank Paul Simon, who does not really give permission for anyone to sing (& # 39; Bridge Over Troubled Water & # 39;) because it was very important to him, and he (Lee) gave him a 30 minute clearance, "Cowell said.

Kodi Lee wowed the "America's Got Talent" judges again Tuesday. (Photo: Trae Patton / NBC)

Lee's performance brought tears to the eyes of Union and Julianne Hough and encouraged most of the repetitive chants of "Kodi! Kodi!" to applause.

"Who you are, what you stand for and what you continue to do is make the world a better place," the Union said in its Golden Buzzer motion.

Cowell added: "You are truly one of the most extraordinary people and talents that we have the great fortune to have in any show we have performed. God bless you."

Impressionist Greg Morton also raised the bar on his voice-over impressions of the films "The Lion King," "Shrek," "Ace Ventura: Detective Pet," "Braveheart" and "Guardians of the Galaxy. "

"I had a concern, going to Dolby, whether you owned the stage or not, and you really proved me wrong," Cowell said. "It's like a step back from you previous audition."

Howie Mandel added, "You're the biggest variation of a person's show."

Other works performed on Tuesday included black light painter Alex Dowis; risk acting Bir Khalsa; singer Carmen Carter; the Emerald Belles drill dance team; girls GFORCE; the acrobatic Messoudi Brothers; and the Voice of Service quartet.

The fate of the tournaments is no longer in the hands of the judges. It's in America.

Fans can vote up to 10 times for each act on NBC.com/AGTvote or through the "America's Got Talent" app. The acts leading up to the semifinals will be revealed in the results of Wednesday's show, which will include guest appearances from "AGT" winners Shin Lim and Bianca Ryan. (NBC, 8 EDT / PDT)

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