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 Concerto No. 4 (Beethoven)
Ludwig van Beethoven's Piano Concerto No. 4 in G major, Op. 58, was composed in 1805–1806. Beethoven was the soloist in the public premiere as part of the concert on 22 December 1808 at Vienna's Theater an der Wien.