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The Clavier-Übung III, sometimes referred to as the German Organ Mass, is a collection of compositions for organ by Johann Sebastian Bach, started in 1735–36 and published in 1739. It is considered Bach's most significant and extensive work for organ, containing some of his most musically complex and technically demanding compositions for that instrument.
In its use of modal forms, motet-style and canons, it looks back to the religious music of masters of the stile antico, such as Frescobaldi, Palestrina, Lotti and Caldara. At the same time, Bach was forward-looking, incorporating and distilling modern baroque musical forms, such as the French-style chorale.The work has the form of an Organ Mass: between its opening and closing movements—the prelude and "St Anne" fugue in E♭ major, BWV 552—are 21 chorale preludes, BWV 669–689, setting parts of the Lutheran mass and catechisms, followed by four duets, BWV 802–805. The chorale preludes range from compositions for single keyboard to a six-part fugal prelude with two parts in the pedal.
The purpose of the collection was fourfold: an idealized organ programme, taking as its starting point the organ recitals given by Bach himself in Leipzig; a practical translation of Lutheran doctrine into musical terms for devotional use in the church or the home; a compendium of organ music in all possible styles and idioms, both ancient and modern, and properly internationalised; and as a didactic work presenting examples of all possible forms of contrapuntal composition, going far beyond previous treatises on musical theory.
The author has given here new proof that in this kind of composition he excels many others in experience and skill. No-one can surpass him in this sphere, and very few indeed will be able to imitate him. This work is a powerful argument against those who have ventured to criticize the music of the Court Composer.
Luther, however, had written a greater and a smaller catechism. In the former he demonstrates the essence of the faith; in the latter he addresses himself to the children. Bach, the musical father of the Lutheran church, feels it encumbent on him to do likewise; he gives us a larger and smaller arrangement of each chorale ... The larger chorales are dominated by a sublime musical symbolism, aiming simply at illustrating the central idea of the dogma contained in the words; the smaller ones are of bewitching simplicity.

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