They got Pharrell who is the hottest musical artist/producer right now. I don't think someone like Gaga is out of the question.
By not so hot, i just mean that she's someone who could benefit from The Voice. And she's someone I think would be very good at it, and her personality would work. Plus, I think I just want to sit her next to Blake and watch that interaction.
Madonna would be awesome. I wonder what her relationship with Carson Daly is. I've gotten the impression that the coaches picked originally were all friends of Carson's. Which to me made sense. He knows a lot of musicians, and would know who would be the right fit. (No way would he ever suggest Mariah Carey as a coach, for instance.) He said he babysat Usher and had followed Shakira's career from way early on. The show has it's own pull now, but I always got the sense that he was part of the pull early on..and likely still has a say in "fit."