The Waldstein Sonata, formally known as Piano Sonata No. 21 in C major, Op. 53, is a significant work composed by Ludwig van Beethoven around 1804-1805. This sonata is notable for its innovative use of sonata form, emotional depth, and virtuosic demands on the performer, representing a key example of Beethoven's middle period as he expanded classical forms and pushed the boundaries of musical expression.
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