The series is known for being the final show Gugu Liberato hosted prior to his death on November 21, 2019.
During each heat, performers try and outscore their competitors in order to earn a seat on the top three podium.
If, at any time, someone reaches the maximum score and makes the 100 judges stand up at once ensures a direct place for the grand finale.
For the sing-off at the end of the show, scores are reset to zero and the 2nd and 3rd placed acts perform a new song chosen from a given shortlist.
They were cast to include a diverse mix of ages, backgrounds and a variety of music genres.