Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.

Armida (Hob. XXVIII/12) is a 1784 opera (dramma eroico) in three acts by Austrian composer Joseph Haydn, set to an Italian-language libretto taken from Antonio Tozzi's 1775 opera Rinaldo, as amended by Nunziato Porta, and ultimately based on the story of Armida and Rinaldo in Torquato Tasso's poem Gerusalemme liberata (Jerusalem Delivered).

Philemon und Baucis, oder Jupiters Reise auf die Erde (Philemon and Baucis, or Jupiter's Journey to Earth), Hob. XXIXb:2, is an opera in one act by Austrian composer Joseph Haydn to a German libretto, possibly by Prince Esterházy's librarian, Phillip Georg Bader. The text is based upon a play by G. K. Pfeffel, itself a retelling of the Baucis and Philemon myth from Ovid's Metamorphoses. The work is in the form of a Singspiel.

Il mondo della luna (The World on the Moon), Hob. XXVIII:7, is an opera buffa by Joseph Haydn with a libretto written by Carlo Goldoni in 1750, first performed at Eszterháza, Hungary, on 3 August 1777. Goldoni's libretto had previously been set by six other composers, first by the composer Baldassare Galuppi and performed in Venice in the carnival of 1750. It was then adapted for Haydn's version of the opera, which would be performed during the wedding celebrations of Count Nikolaus Esterházy, the younger son of Haydn's patron, Prince Nikolaus Esterházy, and the Countess Maria Anna Wissenwolf. It is sometimes performed as a singspiel under its German title Die Welt auf dem Monde.

Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.

L’incontro improvviso (The unexpected encounter) (Hob. XXVIII:6) is an opera in three acts by Joseph Haydn first performed at Eszterháza on 29 August 1775 to mark the four-day visit of Archduke Ferdinand, Habsburg governor of Milan, and his consort Maria Beatrice d'Este. The opera is designated a dramma giocoso (a comic opera) and is an example of the then Austrian fascination with Turkish subjects.

Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.

L'isola disabitata (English: The Uninhabited Island), Hob. 28/9, is an opera (azione teatrale in due parti) by Joseph Haydn, his tenth opera, written for the Eszterházy court and premiered on 6 December 1779. The libretto is the only one by Metastasio set by Haydn. The libretto had been originally set by Giuseppe Bonno (1754, Vienna) and subsequently used by Manuel García. Nino Rota has set excerpts to music as well. The libretto was adapted into French and set by F. I. Beck in Bordeaux in the same year as Haydn as L'isle déserte. A later German version was as a Singspiel Die wüste Insel (Hob. XXVIII:9). Haydn's work has long been remembered for its dramatic Sturm und Drang overture, but the rest of the opera did not see print until H. C. Robbins Landon's 1976 edition (only available for rental). A new edition by Thomas J Busse was prepared in 2007 and is now online. The piece is striking for its use of orchestral recitativo accompagnato throughout. Unrelated to Metastasio there is also a libretto of the same title by Carlo Goldoni (using the pen name Polisseno Fegeio), set by Giuseppe Scarlatti in 1757; it concerns a Chinese woman and Dutch sailors and was revived in 1760 (and again in Vienna in 1773) under the title La cinese smarrita.

La canterina (The Songstress or The Diva), Hob. XXVIII/2, is a short, two-act opera buffa by Joseph Haydn, the first one he wrote for Prince Esterhazy. Based on the intermezzo from the third act of Niccolò Piccinni's opera L'Origille (1760), it lasts about 50 minutes. It was written in 1766, and was premiered in the summer of that year. It was originally intended as a pair of intermezzi, each of the two acts coming between the acts of an opera seria. Similar works include La serva padrona by Pergolesi and Pimpinone by Telemann.

La fedeltà premiata (Fidelity Rewarded), Hob. XXVIII/10, is an opera in three acts by Joseph Haydn first performed at the Eszterháza palace in Fertőd, Hungary, on 25 February 1781 to celebrate the reopening of the court theatre after a fire. The opera was revised for a new version first performed in 1782.

Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.

Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.

Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.

Joseph Haydn was a prolific composer of the classical period. He is regarded as the "father of the symphony" and the "father of the string quartet" for his more than 100 symphonies and almost 70 string quartets. Haydn also produced numerous operas, masses, concertos, piano sonatas and other compositions. Haydn's works were catalogued by Anthony van Hoboken in his Hoboken catalogue. Unlike most other catalogues which sort works chronologically, the Hoboken catalogue sorts by musical genre.