Above: Chopin, Frédéric, 1810-1849. Grande polonaise brillante pour piano, op. 53, 1843. *Mus.C455
Above: Chopin, Frédéric, 1810-1849. Grande polonaise brillante pour piano, op. 53, 1843. *Mus.C4555.B846cBelow: Chopin, Frédéric, 1810-1849. Autograph manuscript letter (signed) to Heinrich Albert Probst in Leipzig; Paris, 1838 October 24. MS Thr 518 (39)Houghton Library, Harvard University -- source link
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