The commercial emo that has earned Tennessee's Paramore platinum sales is still present on their fourth album, as are the unremarkable ballads, but there's also a new willingness to try other genres. The results are mixed: Ain't It Fun's gospel coda does it no favours; Now opens like the Yeah Yeah Yeahs before inane lyrics hobble the chorus; Future builds from a mumbled intro to gorgeous Explosions in the Sky-style post-rock. Perhaps more tellingly, there's much that sounds like No Doubt shortly before Gwen Stefani outgrew them and became a major solo star, which is what you rather suspect lead singer Hayley Williams's record company has in mind for her.