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File:Manuscript of the Piano Sonata No. 14 in C-sharp minor Op.27-2 by Beethoven (trimmed).pdf - Wikimedia Commons
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Ludwig van Beethoven, Wilhelm Kempff – Sonata Para Piano Nº 21 "Waldstein", Nº 25, Nº 15 "Pastoral" y Nº 24 (1971, Vinyl) - Discogs
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