Tonight is the premiere of ' The Voice' where the contestants sing without being seen by the panel.  The panel then choices who they would like to mentor based on that person's voice only.  The panel includes Blake Shelton, Cee Lo Green, Adam Levine and Christina Aguilera. They call themselves coaches not 'judges' and in this video the coaches go 'Crazy'.  Watch as they perform together and see 'The Voice' on  NBC tonight.