Ben Harper will open for Pearl Jam on Sept. 21-22 at KeyArena, we were just informed by — who else? — Ashley Graham.At which point we replied: “Is PJ playing with the hyper-religious, Marley-meets-folk rock Ben Harper, or Jack Johnson’s secular Marley-meets-adult contemporary/backs-up-Toots-in-order-to bolster-street-cred homey Ben Harper? Because there really are two Ben Harpers, and they both sound pretty much the same.”