To celebrate the release of his twenty-seventh studio album, the gorgeous O Sun O Moon, Bruce Cockburn will perform more than forty solo shows this year throughout North America and into the U.K. It is an ambitious schedule for any performer. At seventy-eight, with profound osteoarthritis and a congenital condition that limits his mobility, Cockburn sounds better than ever. His voice is clear and strong with a richer tone and perhaps greater range than in younger days. And his guitar playing, although not as acrobatic as it was forty years ago, is jaw-dropping. Playing the Royal Oak Music Theatre in Royal Oak, Michigan, in mid-June, the Canadian-born California resident demonstrated why he is recognized as one of the most important singer-songwriters and outstanding guitarists of his generation.