Saturday, March 18, 7:30 p.m., Church of the Holy Communion, Episcopal, 4645 Walnut Grove Sunday, March 19, 3 p.m., St. Peter Catholic Church, 190 Adams Avenue at Third, Memphis The Wolf Rivers Singer concerts are well known, not for a concert set list of familiar tunes, but instead for using music to explore the world around us, the issues we face and the history we share. The March 18-19 concerts are no different. Director Ben Legett continues to follow the “Finding O