William McCorkle plays two organ preludes based on the Reformation hymn tune: Erhalt uns Herr bei deinem Wort (Sustain Us, Lord, in Your Word). For a hymn text written by Martin Luther (1483-1546), the German musician, Johann Walter (1496-1570) adapted a plainsong melody. In our Glory to God hymnal at Lexington Presbyterian, this tune is used for the Lenten hymn The Glory of These Forty Days), which we sang in this morning’s worship. Today’s organ preludes, based on this hymn melody, are by two great German organists of the 17th century: Dietrich Buxtehude (1637-1707), the leading musician in the northern town of Lübeck, and Johann Pachelbel (1653-1706), who flourished in the Bavarian town of Nürnberg. These organ works are in the public domain.