Churches often feature organists or pianists who play during services, and these musicians come from all walks of life. One Upper Valley accompanist grew up surrounded by Episcopalian hymns; another played throughout his childhood and during his decades-long Army career. One woman did not begin to play until later in life, after the busyness of school, marriage, and children had subsided. Whatever their backgrounds, they all share a passion for church music that keeps them coming back, Sunday after Sunday. Accompanists are often longtime devotees to their craft, learning to play at an early age and continuing throughout their lives. Ginny Dow, of Hartland, taught …