Piano Sonata No. 23 (Beethoven)

Ludwig van Beethoven's Piano Sonata No. 23 in F minor, Op. 57 (colloquially known as the Appassionata, meaning "passionate" in Italian) is among the three famous piano sonatas of his middle period (the others being the Waldstein, Op. 53 and Les Adieux, Op. 81a); it was composed during 1804 and 1805, and perhaps 1806, and was dedicated to Count Franz von Brunswick. The first edition was published in February 1807 in Vienna.

Unlike the early Sonata No. 8, Pathétique, the Appassionata was not named during the composer's lifetime, but was so labelled in 1838 by the publisher of a four-hand arrangement of the work.

One of his greatest and most technically challenging piano sonatas, the Appassionata was considered by Beethoven to be his most tempestuous piano sonata until the twenty-ninth piano sonata (known as the Hammerklavier). 1803 was the year Beethoven came to grips with the irreversibility of his progressively deteriorating hearing.

An average performance of the entire Appassionata sonata lasts about twenty-five minutes.

The sonata, in F minor, consists of three movements:

A sonata-allegro form in 12
8 time, the first movement progresses quickly through startling changes in tone and dynamics, and is characterised by an economic use of themes.

The main theme, in octaves, is quiet and ominous. It consists of a down-and-up arpeggio in dotted rhythm that cadences on the tonicized dominant, immediately repeated a semitone higher (in G♭). This use of the Neapolitan chord (e.g. the flattened supertonic) is an important structural element in the work, also being the basis of the main theme of the finale.

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