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Music as Science, The C Minor Series No. 9: The Mountain-Top—Beethoven's Op. 111 — Foundation For The Revival of Classical Culture
Beethoven Sonata No. 23 – Op. 57 “Appassionata” (Complete) Sheet music for Piano (Solo) | Musescore.com
Is there a list available of major piano repertoire that indicates how difficult each piece is? - Quora
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