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 Hob. XVI/20
The "Sonata" in C minor (Hob. XVI/20, L. 33) is a keyboard sonata composed by Joseph Haydn in 1771. It is also referred to as a piano sonata. The three-movement work was published by Artaria in 1780 in a set of six sonatas dedicated to the sisters Katharina and Marianna Auenbrugger.