Soli Deo Gloria
Perhaps over the years you have noticed that a frequent title in Advent preludes and postludes is Savior of the Nations, Come (Nun komm, der Heiden Heiland). Johann Sebastian Bach arranged it for organ several times and composed two cantatas based on the hymn, for it was the hymn most closely associated with Advent in the 18th century German church. Martin Luther actually derived this hymn from a beloved Latin hymn, Veni redemptor gentium.