This riveting performance (at Riverbank Arts Centre on March 22nd)  weaves the distinct strands of film, live music and images to allow the audience to experience a four-year artistic response by Cormac Breatnach, arising out of a single traumatic event which affected him from the age of 13 into his adulthood. Breatnach’s brother, Osgur, was one of three men wrongfully …