Rusalka (pronounced [ˈrusalka] ^ⓘ), Op. 114, is an opera ('lyric fairy tale') by Antonín Dvořák. His ninth opera (1900–1901),^[1] it became his most successful, frequenting the standard repertoire worldwide. Jaroslav Kvapil wrote the libretto^[2] on Karel Jaromír Erben's and Božena Němcová's fairy tales. The rusalka is a water sprite from Slavic mythology; it usually inhabits a lake or river.

For many years unfamiliarity with Dvořák's operas outside the Czech lands helped reinforce a perception that composition of operas was a marginal activity, and that despite the beauty of its melodies and orchestral timbres Rusalka was not a central part of his output or of international lyric theatre. In recent years it has been performed more regularly by major opera companies.^[1] In the five seasons from 2008 to 2013 it was performed by opera companies worldwide far more than all of Dvořák's other operas combined.^[3]

The most popular excerpt from Rusalka is the soprano aria, the "Song to the Moon" ("Měsíčku na nebi hlubokém") for the title character in act 1, which is often performed in concert and recorded separately. It has also been arranged for violin and used on film soundtracks.

Dvořák had played viola for pit orchestras in Prague (the Estates Theatre from 1857 until 1859 while a student, then from 1862 until 1871 at the Provisional Theatre). He thus had direct experience of a wide range of operas by Mozart, Weber, Rossini, Lortzing, Wagner, Verdi as well as his compatriot Smetana.

Kvapil's libretto was written before he had any contact with the composer. The plot contains elements which also appear in The Little Mermaid by Hans Christian Andersen and in Undine by Friedrich de la Motte Fouqué,^[2] and has been described as a "sad, modern fairy tale", in a similar vein to his previous play, Princessa Pampeliška.^[4] The libretto was completed by 1899, when Kvapil began looking for composers interested in setting his text to music. His composer friends were engaged with other works, but mentioned that Dvořák was looking for a project. The composer, always interested in Erben's stories, read the libretto and composed his opera quite rapidly, with the first draft begun on 22 April 1900 and completed by the end of November.^[5] Coming after his four symphonic poems inspired by the folk-ballads of Erben of 1896–97, Rusalka may be viewed as the culmination of Dvořák's exploration of a "wide variety of drama-creating musical techniques".^[1]

Rusalka was first performed in Prague on 31 March 1901, with Růžena Maturová as the first Rusalka. It became an enormous success in Czech lands, and soon gained success also abroad.^[6] Shortly after the premiere Dvořák was in contact with Mahler, then at the Vienna Court Opera about mounting the work there, and having met Mahler signed a contract for a production to take place, but this fell through.^[7]

The first performance outside Bohemia took place in Ljubljana.^[8] The opera was given in Vienna by a Czech company in 1910; in German translation it was given in Stuttgart in 1935.

The UK stage premiere was given by John Lewis Opera at Peter Jones, Sloane Square in May 1950. The Times commented: "It is left to amateurs to stage for us those operas by composers howsoever eminent which do not get into the international repertory".^[9] The first professional performances were at Sadler's Wells Theatre in 1959; a 1983 production by English National Opera was filmed and revived several times.^[5]

The United States premiere of the opera was presented by the San Diego Opera in 1975 with Kathryn Bouleyn in the title role.^[10] Rusalka was first performed in New York at the Metropolitan Opera in 1993, a production from the Vienna State Opera, directed by Otto Schenk, with Gabriela Beňačková and Neil Rosenshein.^[11] The 2007 production by Opera Australia with Cheryl Barker in the title role and Richard Hickox conducting won the Helpmann Award for Best Opera.

Rusalka is scored for 2 flutes, 1 piccolo, 2 oboes, 1 English horn, 2 clarinets, 1 bass clarinet, 2 bassoons, 4 horns, 3 trumpets, 3 trombones, 1 tuba, percussion, harp and strings.

Dvořák's music is generally through-composed, and uses motifs for Rusalka, her damnation, the water sprite and the forest.^[8] His word-setting is expressive while allowing for nationally inflected passages, and Grove judges that the work shows the composer at the height of his maturity.^[5] He uses established theatrical devices – dance sections, comedy (Gamekeeper and Turnspit) and pictorial musical depiction of nature (forest and lake).^[1] Rodney Milnes (who provided the translation for an ENO production) admired the "wealth of melodic patterns that are dramatic in themselves and its shimmering orchestration".^[12] One writer considers the final section of the opera – the duet for the prince and Rusalka – as "[twelve] or so of the most glorious minutes in all opera" in their "majestic, almost hymnic solemnity"^[1] while another describes the opera as a "vivid, profoundly disturbing drama".^[12]

In 2014 slovak conductor and composer Marián Lejava made version for chamber orchestra which was premiered in Theatre Biel Solothurn in 2014 and later in other theaters.