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Little is known of Michael Bach, and his music has been overshadowed by his better-known contemporaries such as Pachelbel and Walther, and later by the towering figure of his nephew Sebastian Bach. Nevertheless, he was a respected musician in his day. Upon his appointment as organist to the church at Erfurt, the minister and the town commissioners wrote a letter of thanks to the Count for providing the community and the church with "a quiet, modest, and experienced artist." His salary is recorded as "72 gilden, 18 cords of wood, five measures of corn, nine measures of barley, with leave to brew three and a half barrels of beer, and a few other trifles in kind, a piece of pasture land, and free residence."
Today's offertory motet is a splendid example of Michael Bach's compositional style. The work unfolds as a four-part chorale (a specifically German style of hymnody), and about a third of the way through, a fifth upper voice is added, almost like a descant, superimposing the melody and text of another chorale (Christus, der ist mein Leben) over the beautifully harmonized melody that is already in progress. The result is a rich baroque sonority that acts as an effective foil to the lugubrious and strained sentiments of the text.