Their rendition of My African Dream aired on US TV on Tuesday night, 25 June.
AGT is one of the biggest talent shows in the world and the winning act receives a $1 million prize and global recognition.
Both Gabrielle Union and Simon Cowell spoke words of awe to the choir saying they have been waiting for a group with their energy to come along, and cause a surge of hope in everyone.
The choir has been around for 10 years, having started in 2009 as an after-school activity community programme for disadvantaged kids. For the members, the choir is not just a hobby, but a way to escape the many social problems surrounding them in their communitites.
Ndlovu Youth Choir sings in all 11 South African languages.
By: Aneeqa Du Plessis