1. Angelica Hale, Kechi and Mandy Harvey Shine in 'America's Got Talent' Semifinal

Angelica Hale, Kechi and Mandy Harvey Shine in 'America's Got Talent' Semifinal

Angelica Hale, Kechi and Mandy Harvey Shine in 'America's Got Talent' Semifinal

Season 12's semifinal round of America's Got Talent closed the curtain on Tuesday night (Sept. 12) with six live singing performances, a mind reader, three dances and, yes, a performance by dogs. 

When it came to singing, deaf singer-songwriter Mandy Harvey stole the show with an original song, "Release Me." Harvey lost her hearing 10 years ago because of a connective tissue disorder, and her dedication to pursuing music anyway has inspired AGT judges and audiences since her audition of another original song, "Try," on June 6 (which earned her judge Simon Cowell's Golden Buzzer and a tweet from Lady Gaga).

Harvey has been associated with her ukulele, but on Tuesday night, she signed her lyrics as she sang.

And as Kechi, a plane crash survivor, sang a cover of Frances' "Don't Worry About Me," judge Mel B. wiped tears from her cheeks. The intro of the song relays a relevant message of resilience: "Even if I fall down when you're not around/ Don't worry about me, don't worry about me." 

The younger contestants, nine-year-old Celine Tam and 10-year-old Angelica Hale, also each wowed. Tam sang "How Far I'll Go" from Moana, and Hale belted out Usher's vocal from David Guetta's "Without You." Watch the (grown-up) performances below.