Four finalists defend their spots on stage against new singers determined to replace them. Viewers submit audition tapes and vote for contestants.
If the Four are outperformed, they go home and their challengers take their place. Winner named at end of season.
Awards show featuring popular songs and artists based on the iHeartRadio Chart, decided by consumer listening habits on radio and online.
Inaugural show had memorable moments including Pitbull and GRL's opening number on a yacht, tributes to Pharrell, and Usher's Michael Jackson dance.