Ludwig van Beethoven's Piano Sonata No. 29 in B-flat major, Op. 106 (known as the Große Sonate für das Hammerklavier, or more simply as the Hammerklavier) is a piano sonata widely considered to be one of the most important works of the composer's third period and among the greatest piano sonatas. It is widely considered Beethoven's single most challenging composition for the piano, and it remains one of the most challenging solo works in the classical piano repertoire.
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