Question: Le roi d'Ys and Serse, is which type of play?

Context articles: Le roi l'a dit
Serse
Pascal Mazzotti
Beyond the Invisible
Trance Atlantic Air Waves
Le Roi Est Mort, Vive Le Roi!
The king is dead, long live the king!
T.N.T. for the Brain
Trilogy (Enigma album)
Le roi d'Ys

Le roi l'a dit ("The King Has Spoken") is an opéra comique in three acts by Léo Delibes to a French libretto by Edmond Gondinet.
 It is a lively comedy, remarkably requiring 14 singers – six men and eight women.
 The libretto had first been offered in 1871 to Offenbach; the title also went through various permutations ("Le Talon rouge", "Si le Roi le savait", "Le Roi le sait") before settling on its final name.
 The 1885 revival brought further modifications to the libretto.
Serse (] ; English title: "Xerxes"; HWV 40) is an opera seria in three acts by George Frideric Handel.
 It was first performed in London on 15 April 1738.
 The Italian libretto was adapted by an unknown hand from that by Silvio Stampiglia for an earlier opera of the same name by Giovanni Bononcini in 1694.
 Stampiglia's libretto was itself based on one by Nicolò Minato that was set by Francesco Cavalli in 1654.
 The opera is set in Persia (modern-day Iran) in 480 BC and is very loosely based upon Xerxes I of Persia, though there is little in either the libretto or music that is relevant to that setting.
 Serse, originally sung by a soprano castrato, is now usually performed by a soprano (or mezzo-soprano) and sopranist.
Pasquale "Pascal" Mazzotti (16 December 1923 in Saint-Étienne-de-Baïgorry – 19 June 2002 in Saint-Ouen-l'Aumône) was a French actor who has appeared in film, television, and theater.
 He is known for having played a role in "Hibernatus" with Louis de Funès, as well as provided the voice of Le roi (The King) in the animated feature film, "Le Roi et l'oiseau" ("The King and the Mockingbird").
"Beyond the Invisible" is a 1996 song created by the musical project Enigma.
 This is the first of only two singles taken from the album "Le Roi est mort, vive le Roi!
".
 A remake was released by Scooter in 2011.
Trance Atlantic Air Waves (also known as TAAW), is a side project from Enigma's Michael Cretu.
 He had previously worked with Jens Gad on Enigma's 1996 release "Le Roi Est Mort, Vive Le Roi!
" and they once again teamed up for this side project.
 Only one studio album was released, "The Energy of Sound", by Virgin Records.
 Most of the songs were cover versions but there were also three original songs.
Le Roi Est Mort, Vive Le Roi!
 (French for "The King Is Dead, Long Live The King! ")
 is the third studio album by the German musical project Enigma.
"The King is dead, long live The King!"
 (French: "Le roi est mort, vive le roi!"
 ; Spanish: "El rey ha muerto, ¡viva el rey!"
 ; Italian: "Il re è morto, lunga vita al re!"
 ; Portuguese: "O rei está morto, longa vida ao rei!" )
, or simply "long live the king!"
, is a traditional proclamation made following the accession of a new monarch in various countries.
 The seemingly contradictory phrase is used to simultaneously announce the death of the previous monarch and assure the public of continuity by saluting the new monarch.
"T.N.T. for the Brain" is a 1997 song created by the musical project Enigma.
 This single is the second and last one taken from "Le Roi est mort, vive le Roi!
", Enigma's third album.
Trilogy is a box set by the German musical project Enigma.
 This set includes the first three studio albums by Enigma, "MCMXC a.D.", "The Cross of Changes", and "Le Roi est mort, vive le Roi!
", which comprises their artistic output from 1990–1996.
Le roi d'Ys ("The King of Ys") is an opera in three acts and five tableaux by the French composer Édouard Lalo, to a libretto by Édouard Blau, based on the old Breton legend of the drowned city of Ys.
 That city was, according to the legend, the capital of the kingdom of Cornouaille.