"Johann (Georg) Andreas Stein (16 May 1728 in Heidesheim – 29 February 1792 in Augsburg), was an outstanding German maker of keyboard instruments, a central figure ...
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in the history of the piano. He was primarily responsible for the design of the so-called "Viennese" fortepiano, for which the piano music of Haydn, Mozart, and the early Beethoven was written." - (en.wikipedia.org 31.10.2019)