Wachet auf, ruft uns die Stimme BWV 645 Johann Sebastian Bach
Wake, Awake for Night is Passing - Bach published this piece as the first of the Schübler Chorales. Performed on the Gabler organ in the Basilica of Weingarten, Germany (thanks to chwidder for the info). IV-Manual/169 Ranks/63 Stops - 6,631 pipes