Christina Aguilera, Cee Lo Green Sing 'Crazy' In 'The Voice' Preview

It's been almost impossible to avoid the avalanche of promotion for NBC's new reality singing competition, "The Voice." From splashy magazine ads to endless TV promos and interviews with the show's four celebrity coaches, the show has been getting a full-court blitz in the lead-up to Tuesday night's premiere.The biggest push to date occurred Thursday night, when a 12-minuteteaser aired before "