This melody is well-known simply as "Arioso." It appears twice in Bach's work: as the sinfonia to the cantata BWV 156, and in a more ornamented version as the second movement of the harpsichord concerto in F minor, BWV 1056.
"Wachet auf, ruft uns die Stimme." One of the Schübler chorale settings, this is Bach's arrangement for organ of the famous tenor setting of "Sleepers Awake" from Cantata 140.
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