The text underlay in the choral portions of this score is quite unusual. As shown in the accompanying scan, where the text-setting is uniform, only the bass voice is given text underlay. The upper voices receive their own underlay only when their text-setting deviates from that of the bass.
August Wilhelm Bach was not a relation of the famous Bachs of Leipzig. He was the director of the Royal Institute of Church Music in Berlin and wrote predominantly sacred music and works for keyboard.MUS-15202$35