Steve Poltz is one of the most charismatic live folksingers working today. Whether he’s playing little club in Halifax, or trading verses with Jewel (whose hit song “You Were Made for Me” he co-wrote), or serenading Cayamo, Poltz is Poltz, full on and no exceptions. Hence the the superlative, announced each night, by the man himself: “This is the Greatest Show of My Life!”