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").
Cello Sonatas Nos. 4 and 5 (Beethoven)
The Sonatas for cello and piano No. 4 in C major, Op. 102, No. 1, and No. 5 in D major, Op. 102, No. 2, by Ludwig van Beethoven were composed simultaneously in 1815 and published in 1817 with a dedication to the Countess , a close friend and confidante of Beethoven's.