MASON CITY | The music being played and sung in churches throughout North Iowa this Easter Sunday ranges from centuries-old hymns to contemporary. Grace Evangelical Free Church in Mason City. In th. As she’s done for two decades, the Presbyterian Church (USA) minister from Philadelphia. Harry Plantinga, director of Hymnary, a 10-year-old online index of hymnals, said the Hymn Society’s confere. TRAVERSE CITY — “You’re a Grand Old Flag. the…