query: How many symphonies did Haydn compose?
passage: List of symphonies by Joseph Haydn
There are 106 symphonies by the classical composer Joseph Haydn (1732–1809). Of these, 104 have numbers associated with them which were originally assigned by Eusebius Mandyczewski in 1908 in the chronological order that was known at the time.[1] In the subsequent decades, numerous inaccuracies in the chronology (especially in the lower numbers) were found, but the Mandyczewski numbers were so widely used that when Anthony van Hoboken compiled his catalogue of Haydn's works, he incorporated the Mandyczewski number into Catalogue I (e.g., Symphony No. 34 is listed as Hob. I/34).[1] Also in that time period, two additional symphonies were discovered (which were assigned non-Mandyczewskian letters "A" and "B"), bringing the total to 106.
passage: String Quartets, Op. 76 (Haydn)
The six String Quartets, Op. 76 by Joseph Haydn were composed in 1797 or 1798 and dedicated to the Hungarian count Joseph Georg von Erdődy (1754–1824). They form the last complete set of string quartets that Haydn composed. At the time of the commission, Haydn was employed at the court of Prince Nicolaus Esterházy II and was composing the oratorio "The Creation" as well as Princess Maria Hermenegild Esterházy's annual mass.