Piano sonatas (Beethoven)
Ludwig van Beethoven wrote his 32 piano sonatas between 1795 and 1822. Although originally not intended to be a meaningful whole, as a set they compose one of the most important collections of works in the history of music. Hans von Bülow called them "The New Testament" of the piano literature (Johann Sebastian Bach's "The Well-Tempered Clavier" being "The Old Testament").
Piano sonata
All the well-known Classical era composers, especially Joseph Haydn, Muzio Clementi, Wolfgang Amadeus Mozart, and Ludwig van Beethoven, wrote many piano sonatas. Muzio Clementi wrote more than 110 piano sonatas. He is well known as "The Father of the Pianoforte". Clementi's Opus 2 was the first real piano sonata composed. The much younger Franz Schubert also wrote many.