# 1784 in music
## Events

* January 5 – In Paris, Antonio Salieri signs a contract with the Opéra for a work entitled Les Danaïdes.
* January 7 – Composer Pierre-Alexandre Monsigny marries Amélie de Villemagne.
* February 9 – The Piano Concerto No. 14 becomes the first entry in the catalogue of works by Wolfgang Amadeus Mozart.
* March – 28-year-old Mozart gives the first performances of his Piano Concerto No. 15 at the Trattnerhof and Burgtheater in Vienna.
* April 24 – Mozart writes to his father Leopold, recommending the work of newcomer Ignaz Pleyel.
* April 29 – Wolfgang Amadeus Mozart and violinist Regina Strinasacchi perform Mozart's Sonata in B-flat for Violin and Keyboard (K.454) for the first time, in the presence of Joseph II, Holy Roman Emperor.
* May 27 – June 5 – Handel Commemoration concerts in Westminster Abbey, London.
* June 13 – Wolfgang Amadeus Mozart's Piano Concerto No. 17 is performed for the first time, by his student, Barbara von Ployer. Giovanni Paisiello is in the audience.
* August 17 – Luigi Boccherini is given a pay rise of 12000 reals by his employer, the Infante Luis, Count of Chinchón.
* August 28 – In Vienna, Johann Georg Albrechtsberger's Mass in E flat is performed for the first time, with the orchestral arrangement replaced by organ accompaniment, in accordance with the preferences of Joseph II, Holy Roman Emperor.
* December 11 – Mozart is received into the Masonic lodge "Beneficence".
* The first opera is mounted at the unfinished Teatro Nuovo in Bergamo, Lombardy, Giuseppe Sarti's Medonte, re di Epiro.

## Classical music

* Ludwig van Beethoven - Piano Concerto No. 0
* Jean-Jacques Beauvarlet-Charpentier – Journal d'orgue 1–9
* Niel Gow – A Collection of Strathspey Reels, etc.
* Joseph Haydn
** 6 Divertimentos, Hob.IV:6–11
** Keyboard Sonata in G major, Hob.XVI:40 (no. 54)
** Keyboard Sonata in B-flat major, Hob.XVI:41 (no. 55)
** Keyboard Sonata in D major, Hob.XVI:42 (no. 56)
** 24 Lieder, Hob.XXVIa:13–24 (second book)
* Michael Haydn – Symphony in B-flat major; Symphony in C major
* Sabine Hitzelberger – Für fülende Seelen am Klavier
* Edward Jones – Musical and Poetical Relicks of the Welsh Bards, including "Deck the Halls"
* Leopold Kozeluch – Keyboard Concerto in F major, P.IV:1
* Wolfgang Amadeus Mozart
** Piano Concerto No. 14
** Piano Concerto No. 15
* Giovanni Paisiello – Six quartets, Op. 1
* Joseph Reicha – Cello Concerto in D major
* Giovanni Battista Viotti – Duetto concertante for 2 Violins in D major; Duetto concertante for 2 Violins in D minor

## Opera

* Pasquale Anfossi – Issipile, May 8, King's Theatre, London.
* Luigi Cherubini – L'Idalide
* Domenico Cimarosa
** L'apparenza inganna
** Artaserse
** I due supposti conti
** I matrimoni impensati
** L'Olimpiade, July 10, Teatro Eretenio, Vicenza.
** La vanità delusa
* André Grétry
** L'épreuve villageoise
** Richard Coeur de Lion
* Joseph Haydn – Armida
* Thomas Linley – The Spanish Rivals
* Antonio Salieri
** Les Danaïdes
** Il ricco d'un giorno (libretto by Lorenzo Da Ponte)
* Andrea Luchesi – Ademira
* Giovanni Paisiello – Il Re Teodoro
* Niccolò Piccinni – Diane et Endymion
* Antonio Sacchini – Dardanus

## Births

* January 1 – William Beale, composer and organist (died 1854)
* January 27 – Martin-Joseph Mengal, composer (died 1851)
* January 29 – Ferdinand Ries, composer
* February 3 – John Fane, composer and diplomat
* February 27 – Job Plimpton, composer (died 1864)
* March 25 – François-Joseph Fétis, Belgian musicologist, composer, critic and teacher (died 1871)
* April 8 – Dionisio Aguado, guitarist and composer (died 1849)
* June 14 – Francesco Morlacchi, opera composer (died 1841)
* July 27 – George Onslow, composer (died 1853)
* August 5 – Louis Spohr, composer, violinist and conductor (died 1859)
* August 23
** Jeanette Wässelius, operatic soprano (died 1853)
** Henriette Löfman, composer (died 1836)
* October 15 – Thomas Hastings, composer (died 1872)
* October 16 – Karl Keller, composer and flautist (died 1855)
* November 7 – Friedrich Wilhelm Kalkbrenner, German pianist and composer
* date unknown – Samuel Simms, organist and composer (died 1868)
* November 28 – Ferdinand Ries, composer and friend of Beethoven (died 1838)

## Deaths

* March 4 – Ann Cargill, opera singer (born 1760) (drowned)
* July 1 – Wilhelm Friedemann Bach, composer (born 1710)
* August – Louis Anseaume, opera librettist
* August 6 – Karl Kohaut, lutenist and composer (born 1726)
* August 4 – Giovanni Battista Martini, composer (born 1706)
* September – John Bennett, organist and composer (born c.1735)
* September 5 – Maria Linley, singer (born 1763)
* September 12 – Manuel Blasco de Nebra, organist and composer (born 1750)
* October 5 (or 1785) – Antonín Kammel, violinist and composer (born 1730)
* November 6 – Anine Frölich, ballet dancer (born 1762)
* date unknown
** John Pixell, poet and composer (born 1725)
** Yekaterina Sinyavina, pianist and composer (date of birth unknown)