المرجع. 849، 30 رسام في قضية (دراسات آلية)
Op. 849, 30 études (Studies of Mechanism) (LoC), introduction to op. 299 (Czerny, Carl)
Carl Czerny (21 February 1791 – 15 July 1857) was an Austrian composer, teacher, and pianist of Czech origin whose vast musical production amounted to over a thousand works. His books of studies for the piano are still widely used in piano teaching.
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