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Johann Georg Andreas Stein 16 May β 29 February was an outstanding German maker of keyboard instruments, a central figure in the history of the piano. He was primarily responsible for the design of the so-called German hammer action. Pianos with this hammer action, or its more developed form known as the Viennese action, may be said to be appropriate for the performance of the piano music of Haydn , Mozart , and the early works of Beethoven and Schubert.
Stein was born in in Heidelsheim in the Upper Palatinate. He learned his trade as an organ builder from his father in Heidelsheim. Johann Andreas Silbermann was the eldest of the four sons of Andreas Silbermann , the elder brother of Gottfried Silbermann. In the same year, he became an organist at the church.
According to a letter he wrote, he gave up organ building in the s in order to devote himself to stringed keyboard instruments. As a stringed keyboard instrument maker, Stein built clavichords, harpsichords, and pianos. He also built some more extraordinary keyboard instruments, including the "Poli-Toni-Clavichordium" described in the Augsburg Intelligenzblatt in that combined a large harpsichord having four choirs of strings registration 8', 8', 8', 16' with a piano.
He also built the "Melodica," a small organ in which the player's touch could alter volume, which could be used with a harpsichord or a piano or on a separate manual of an organ or simply as a solo instrument. The importance of the Melodica, of which Stein may only have made a few prototypes, lies in Stein's own description. In that published description, he expressed his dissatisfaction with keyboard instruments in general because they did not allow expressivity in the manner of the human voice, the violin and the trombone.
The description of the expressive possibilities of the Poli-Tono-Clavichordium nonetheless shows Stein's confidence in stringed keyboard instruments that in the end led him to the invention of his so-called German hammer action shortly before In both the surviving examples Verona , Naples , the player of the harpsichord 8', 8', 8', 16' in Verona, 8' quill, 8' leather, 4' quill in Naples can also couple the piano action at the other end on one of the harpsichord keyboards.