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Muzio Clementi (January 24, 1752 – March 10, 1832) was a classical composer, and acknowledged as the first to write specifically for the piano.
Clementi composed almost 110 piano sonatas (most of them sonatinas), many of which are still played and many are popular practice pieces in piano education.
Clementi's sonatas are often more difficult to play than Mozart's, though - Mozart, in fact, wrote in a letter to his sister that he would prefer she not play the Clementi's sonatas due to their jumped runs, wide fingerspacing, and chords that he thought would cause injury for her to try to play.
In Vienna, Clementi agreed with Emperor Joseph II to enter a musical duel with Wolfgang Amadeus Mozart for the entertainment of the Emperor and his guests.
Clementi's sonatas are often more difficult to play than Mozart's, though — Mozart, in fact, wrote in a letter to his sister that he would prefer she not play the Clementi's sonatas due to their jumped runs, wide fingerspacing, and chords that he thought would cause injury for her to try to play.
Wolfgang Amadeus Mozart's evident disrespect for Clementi (and perhaps Italians in general) has led some to call them "arch rivals." But the animosity was not as far as we know reciprocated by Clementi, and in any case Mozart's letters are full of irreverent jibes which he never expected to become public.