Season 9 of the vocal talent competition sees the return of hosts Adam Levine, Blake Shelton, Pharrell Williams and Gwen Stefani. They are joined by celebrity advisors Missy Elliot, John Fogerty, Brad Paisley, Selena Gomez and Rihanna. After the Blind Auditions, where coaches pick the artist they want on their team based only on their voice, the contestants go through Battle Rounds and Knockouts, where they compete to gain a spot for the live shows. This season the coaches can bring back four singers eliminated during Knockouts, so they can have a second chance at winning the competition. With Live Playoffs and Live Performance Shows, the contestants have to face a live audience and win the votes of viewers at home.