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. 1 (Beethoven)
Ludwig van Beethoven's Piano Concerto No. 1 in C major, Op. 15, was written in 1795, then revised in 1800. The first performance took place on 18 December 1795 in Vienna with Beethoven himself as soloist. It was first published in 1801 in Vienna with dedication to his pupil Princess Anna Louise Barbara Odescalchi (née Countess von Keglević), known to her friends as "Babette".