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. 2 (Beethoven)
The Piano Concerto No. 2 in B-flat major, Op. 19, by Ludwig van Beethoven was composed primarily between 1787 and 1789, although it did not attain the form it was published as until 1795. Beethoven did write another finale for it in 1798 for performance in Prague, but that is not the finale that it was published with. It was used by the composer as a vehicle for his own performances as a young virtuoso, initially intended with the Bonn Hofkapelle. It was published in 1801 following Beethoven's Piano Concerto No. 1 in C major, which actually had been composed well after this piece in 1796 and 1797.