Question: Which work was performed first, Acis and Galatea, or Dalibor?

Context paragraphs:
Dalibor (opera): Dalibor is a Czech opera in three acts by Bedřich Smetana.  The libretto was written in German by , and translated into Czech by Ervin Špindler.  It was first performed at the New Town Theatre in Prague on 16 May 1868.  The opera received criticism at the time for being overly influenced by German opera, including that of Richard Wagner.

Dio, come ti amo: "Dio, come ti amo" (English translation: "God, How I Love You") was performed first time as duo by Domenico Modugno and Gigliola Cinquetti in San Remo Festival, 1966.  Later it was the Italian entry in the Eurovision Song Contest 1966, performed in Italian by Domenico Modugno.

Zauvijek volim te: "Zauvijek volim te" (Cyrillic: Заувијек волим те, English translation: "I Love You Forever") is a song performed by Stefan Filipović, and was the Montenegrin entry for the Eurovision Song Contest 2008.  It was performed first in the first semi-final on May 20, 2008 but failed to make it to the final.  It got 23 points in total (12 from Bosnia and Herzegovina, 10 from Slovenia and 1 point from San Marino), which was enough only for a 14th place.The 10 and 12 points given make this song the best Montenegrin entry so far.

Te Siento: "Te Siento" (English: I Feel You) is a song performed by reggaeton duo Wisin & Yandel.  The song is taken from Wisin & Yandel's re-release studio album "Evolution".  It was released as the third single on December 15, 2009.  On November 5, 2009 a part of the song was performed first time on the Latin Grammy Awards 2009 along with "Abusadora", using a short intro-video to perform.

Charles Jordan (baritone): Charles Jordan (3 April 191527 June 1986) was a Canadian baritone and voice teacher born in Montreal.  He first studied singing with Adrienne Bourassa in Montreal during the 1930s, and later was a pupil of Albert Whitehead at the Toronto Conservatory of Music from 1941 to 1943.  As a performer he was mainly active on Canadian radio, making his professional debut singing French chassons on CKAC in 1937.  He performed regularly on CKAC and with various Canadian Broadcasting Corporation orchestras in Montreal through 1940.  From 1941 to 1943 he recorded several oratorios and operas by Purcell and Handel for the CBC, including Polyphemus in "Acis and Galatea".  From 1944 to 1950 he worked as a radio singer for both the CBC in Toronto, and for the American radio programs "Sweetwood Serenade" (NBC) and "Sunday Night Serenade" (MBS) in New York City.  After 1950, Jordan divided his time between performing and teaching singing in Toronto.  Several well-known actors studied singing with him, including Susan Clark, Lorne Greene, and William Shatner.  He also made several albums during the 1950s of Canadian classical music and Canadian folk songs.  He is the father of Canadian singer-songwriter Marc Jordan.

Acis et Galatée: Acis et Galatée ("Acis and Galatea") is an opera by Jean-Baptiste Lully.  Unlike most of his operas, which are designated "tragédies en musique", Lully called this work a "pastorale-héroïque", because it was on a pastoral theme and had only three acts (plus a prologue) compared to the usual five.  Otherwise, there is little musically or dramatically to distinguish it from Lully's "tragédies".

Keyboard glockenspiel: The keyboard glockenspiel (French: "jeu de timbre") or organ glockenspiel is an instrument consisting of a glockenspiel operated by a piano keyboard.  It was first used by George Frideric Handel in the oratorio "Saul" (1739).  It was also used in the 1739 revivals of his "Il Trionfo del Tempo" and "Acis and Galatea", and the next year in "L'Allegro, il Penseroso ed il Moderato".  Half a century later, Wolfgang Amadeus Mozart employed a "strumento d’acciaio" in "The Magic Flute" (1791) to represent Papageno's magic bells, and this instrument is believed to have been a keyboard glockenspiel.  This part is nowadays sometimes taken by a celesta.  Maurice Ravel preferred the keyboard version of the instrument because it can play a true ff dynamic for brilliance and iridescence in orchestral climaxes.  In the late 20th century, the firm of Bergerault began manufacturing a three-octave (F2–E4) mallet instrument with a damping mechanism operated by a foot pedal, which is capable of dealing with the wide range called for in contemporary scores.

La Fábula de Polifemo y Galatea: La Fábula de Polifemo y Galatea ("The Fable of Polyphemus and Galatea"), or simply the "Polifemo", is a literary work written by Spanish poet Luis de Góngora y Argote.  The poem, though borrowing heavily from prior literary sources of Greek and Roman Antiquity, attempts to go beyond the established versions of the myth by reconfiguring the narrative structure handed down by Ovid.  Through the incorporation of highly innovative poetic techniques, Góngora effectively advances the background story of Acis and Galatea’s infatuation as well as the jealousy of the Cyclops Polyphemus.

Sweetwater (band): Sweetwater was an American rock band originally from Los Angeles, California.  They were the act scheduled to open the Woodstock Festival in 1969; however, due to being stopped by the police on their way to the festival, folksinger Richie Havens' trio (Daniel Ben Zebulon, percussion, Paul "Deano" Williams, guitar, backing vocals) performed first.  Sweetwater performed next, becoming the first band to perform at the festival.

Acis and Galatea (Handel): Acis and Galatea (HWV 49) is a musical work by George Frideric Handel with an English text by John Gay.  The work has been variously described as a serenata, a masque, a pastoral or pastoral opera, a "little opera" (in a letter by the composer while it was being written), an entertainment and in the New Grove Dictionary of Music an oratorio.  The work was originally devised as a one-act masque which premiered in 1718.

Supporting paragraphs: Acis and Galatea (Handel) Dalibor (opera)
Answer: Acis and Galatea