First there was Madonna’s Grammy duet with Gorillaz; now comes the news that she’s going to make her rock festival debut on April 30 at Coachella, before heading off on her club tour. Is Madge going alternative on us? Do you think she’ll mesh well on a bill that includes Franz Ferdinand, Tool, Clap Your Hands Say Yeah, My Morning Jacket, and the Yeah Yeah Yeahs? I don’t know, but I’d love to be a fly on the wall backstage to hear what Madonna and Karen O or Cat Power have to say to each other.