Just because a band opens up for U2 does not mean they sound like U2. If anything, Kings of Leon sound much more like another band that once opened for Bono and company, the Pixies, if the Pixies deconstructed rock rather than pop. Come to think of it, this also describes the other main reference point here -- 90s grunge. Kings of Leon often seem torn between their stadium rawk impulses and their hip underground aspirations. This makes for interesting tension, but their songs would be improved if they gave in and wrote the big catchy choruses they keep hinting at but shying away from.