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 Trio, WoO. 38 (Beethoven)
The Piano Trio in E-flat major, WoO. 38 is a composition for piano trio by Ludwig van Beethoven, that was discovered amongst Beethoven's papers following his death. It is believed to have been composed in either 1790 or 1791. More conventional in nature than the Piano Trios Op.1, the composition was not published until 1830 by F. P. Dunst in Frankfurt, along with the Allegretto for Piano Trio in B-flat major, WoO. 39 and Piano Sonata in C major, WoO. 51.