After seven nights of auditions for America's Got Talent Season 21, Simon Cowell, Sofia Vergara, Mel B, and Howie Mandel had to decide which contestants would complete the 44-act roster for the quarter-final live shows. Read on for our "Live Acts Revealed" recap of the decisions that determined who will perform in the live shows on America's Got Talent Season 21, Episode 8, which aired July 28 on NBC. Golden BuzzersAlready advancing as part of the 44 live performers are the 10 acts that received a Golden Buzzer from one of the judges during the auditions. Simon's acts are singer Lai Noelle and one-legged parkour athlete Rubén Roldán Bustos. Unanimous DecisionsBefore inviting on-the-fence artists to their homes, the judges decided that there were 18 "no brainer" acts that they could unanimously say deserve to appear in the live shows after their single audition, including country band Pynk Beard and the Jesse White Tumbling Team.