A lively setting of the great hymn "Ein feste Burg" by Martin Luther - it begins sprightly in the style of a Renaissance dance, and builds to a rousing climax with an optional congregational join-in.  2-part + organ (with optional SATB/congregation on the last verse).  And, lest you forget, traditionally, October 31, 1517 is widely held to be the day Brother Martin nailed his Ninety-five Theses on the door of the All Saints' Church in Wittenberg. Yes, Reformation Day - the 500th anniversary!