Don't they pick headlining acts because they're popular, and appeal to a mass audience? It seems to me that Jack Johnson does that. I went to a Jack Johnson show at red rocks a few summers ago, and it was enjoyable enough. I didn't feel the need to rush out and buy any of his cds, but it wasn't the worst concert I've ever been to. I was surprised at how loyal his fans seem to be, and how knowledgable they are about his music.