Achille et Polyxène ("Achilles and Polyxena") is a tragédie lyrique containing a prologue and five acts based on Virgil's "Aeneid" with a French libretto by Jean Galbert de Campistron.
 The opera's overture and first act were composed by Jean-Baptiste Lully, who died from a conducting injury before he could complete the score.
 The prologue and the remaining acts are the work of his pupil Pascal Collasse who finished the work, eight months after Lully's death on March 22, 1687.
 The opera was first performed on November 7, 1687, by the Paris Opera at the Théâtre du Palais-Royal in Paris.
William Joseph Kaiser (born September 15, 1955) is a professor and former department chair of Electrical Engineering at the University of California, Los Angeles (UCLA).
 He is a winner of 2007 Gold Shield Prize and has been a Fellow of American Vacuum Society since 1994.
 He is the director of Actuated Sensing & Coordinated Embedded Networked Technologies research group at UCLA and co-director of UCLA Wireless Health Institute.
Roméo et Juliette ("Romeo and Juliet") is an opera in five acts by Charles Gounod to a French libretto by Jules Barbier and Michel Carré, based on "The Tragedy of Romeo and Juliet" by William Shakespeare.
 It was first performed at the Théâtre Lyrique (Théâtre-Lyrique Impérial du Châtelet), Paris on 27 April 1867.
 This opera is notable for the series of four duets for the main characters and the waltz song ""Je veux vivre"" for the soprano.
La reine de Saba ("The Queen of Sheba") is a grand opera in four or five acts by Charles Gounod to a libretto by Jules Barbier and Michel Carré inspired by Gérard de Nerval's "Le voyage en Orient".
 It was premiered at the Salle Le Peletier by the Paris Opera on February 28, 1862.
 The magnificent, first production was directed by Eugène Cormon, with costumes designed by Alfred Albert and Paul Lormier, and scenery by Édouard Desplechin (Act I), Charles-Antoine Cambon and Joseph Thierry (Acts II and IV, scene 2), Hugues Martin (Act III), and Joseph Nolau and Auguste-Alfred Rubé (Act IV, scene 1).
Carl Joseph Kaiser (born April 8, 1927 in Winnipeg, Manitoba) is a Canadian former professional ice hockey player.
 Kaiser was born into a large family and, as a youth, demonstrated athletic ability, particularly in hockey.
Joseph Kaiser is a Canadian operatic tenor.
 In 2005, he won second prize in Plácido Domingo's Operalia International Opera Competition while competing as a baritone.
 The judges were keen to his talents and potential as a tenor, and proposed that he make the switch to tenor.
 He has performed as a soloist with the New York Metropolitan Opera, making his debut in October 2007 as Roméo in Charles Gounod's "Roméo et Juliette".
 In November he returned to the Met sing the role of Tamino Mozart's "Die Zauberflöte".
Ariane ("Ariadne") is an opera by the French composer Jean-Joseph Mouret, first performed at the Académie Royale de Musique (the Paris Opera) on 6 April 1717.
 It takes the form of a "tragédie en musique" in a prologue and five acts.
 The libretto is by François Joseph Lagrange-Chancel and Pierre-Charles Roy.
Il pomo d'oro ("The Golden Apple") is an opera in a prologue and five acts by the Italian composer Antonio Cesti with a libretto by Francesco Sbarra (1611-1668).
 It was first performed before the imperial court in a specially constructed open-air theatre Vienna in 1668.
 The work was so long it had to be staged over the course of two days: the Prologue, Acts One and Two were given on July 12; Acts Three, Four and Five on July 14.
 Originally planned to mark the wedding of the Habsburg Holy Roman Emperor Leopold I and Margaret Theresa of Spain in 1666, the production was rescheduled to mark the Empress's 17th birthday in 1668.
 The staging was unprecedented for its magnificence (and expense).
 The designer Ludovico Ottavio Burnacini provided no fewer than 24 sets and there were plenty of opportunities for spectacular stage machinery, including shipwrecks and collapsing towers.
Le chevalier d’Harmental is an opéra comique in five acts of 1896, with music by André Messager and a French libretto by Paul Ferrier, after Dumas père and Auguste Maquet.
 The play of the novel – in five acts, a prologue and ten tableaux – was first performed on 16 July 1849 at the Théâtre-Historique in Paris.
 The opera was first performed at the Opéra Comique (Théâtre Sarah Bernhardt) in Paris on 5 May 1896, but ran for only six performances.
 It was seen at the Vienna Hofoper during the 1896-97 season.
Tragédie en musique (Musical tragedy), also known as tragédie lyrique (French lyric tragedy), is a genre of French opera introduced by Jean-Baptiste Lully and used by his followers until the second half of the eighteenth century.
 Operas in this genre are usually based on stories from Classical mythology or the Italian romantic epics of Tasso and Ariosto.
 The stories may not have a tragic ending – in fact, they generally don't – but the atmosphere must be noble and elevated.
 The standard "tragédie en musique" has five acts.
 Earlier works in the genre were preceded by an allegorical prologue and, during the lifetime of Louis XIV, these generally celebrated the king's noble qualities and his prowess in war.
 Each of the five acts usually follows a basic pattern, opening with an aria in which one of the main characters expresses their feelings, followed by dialogue in recitative interspersed with short arias ("petits airs"), in which the main business of the plot occurs.
 Each act traditionally ends with a "divertissement", offering great opportunities for the chorus and the ballet troupe.
 Composers sometimes changed the order of these features in an act for dramatic reasons.

Question: Joseph Kaiser performed in an opera in five acts known as what?
Answer: Roméo et Juliette