Season eight of the "The Voice" premiered on February 23, 2015. It aired on Monday and Tuesday nights at 8 p.m. Eastern Standard Time. In this season, singers were coached by Blake Shelton, Pharrell Williams, Adam Levine and Christina Aguilera.
The first 3 weeks of "The Voice" feature blind auditions where contestants compete for a spot on a professional musician's team. Contestants then sing duets in the Battle Rounds and compete in the Knockout Rounds before singing in the live shows where they are voted for by the general public.
"The Voice" debuted in 2011. The original pros, or coaches, were Adam Levine, Christina Aguilera, Blake Shelton and Cee Lo Green. Former coaches include Gwen Stefani, Usher and Shakira. Pharrell Williams replaced Green at the beginning of the show's seventh season.