Arthur Gunn got the judges fired up Sunday night on American Idol with a bold performance of a Bob Marley classic.“I really didn’t expect that I’d be this far. I’m still trying to grasp it all,” the Kathmandu, Nepal-born singer and guitarist said during his piece-to-camera.He’s still got a ways to go.Performing “one for the Rastafarian,” Gunn put his own spin on Bob Marley and the Wailers’ “Is this Love”.