Adam Levine doesn't think a massive sing-off is a good idea

Adam Levine has cruelly denied the world the chance to witness a 'sing off' between the winners of American Idol, US X Factor and The Voice.

Simon Cowell posited the idea of some kind of hor­rendous singing Olympics via Twitter, but Levine has told Access Hollywood that although it's "kind of a cool idea", The Voice isn't inter­ested in "what everyone else is doing".

"We’re just kind of worrying about what we do ‘cause we all know the more we worry about everybody else, the more the quality of what you’re doing tends to suffer. So, we want to just do what we do," he continued.

Such a shame.