Question: When did the composer of Invention die?

Context articles: Symphony in C (Bizet)
György Ligeti
N. Senada
Die Kluge
Robert Pauli Scherer
Make Them Die Slowly (album)
Partholón
Die Another Day (song)
Louis François Dauprat
Invention (Ligeti)

The Symphony in C is an early work by the French composer Georges Bizet.
 According to "Grove's Dictionary", the symphony "reveals an extraordinarily accomplished talent for a 17-year-old student, in melodic invention, thematic handling and orchestration."
 Bizet started work on the symphony in C major on 29 October 1855, four days after turning 17, and finished it roughly a month later.
 It was written while he was studying at the Paris Conservatoire under the composer Charles Gounod, and was evidently a student assignment.
 Bizet showed no apparent interest in having it performed or published, and the piece was never played in his lifetime.
 He used certain material from the symphony in later works, however.
 There is no mention of the work in Bizet's letters, and it was unknown to his earlier biographers.
 His widow, Geneviève Halévy (1849–1926), gave the manuscript to Reynaldo Hahn, who left it along with other papers to the archives of the conservatory library, where it was found in 1933 by Jean Chantavoine.
 Soon thereafter, Bizet's first British biographer Douglas Charles Parker (1885–1970) showed the manuscript to the conductor Felix Weingartner, who led the first performance in Basel, Switzerland, on 26 February 1935.
György Sándor Ligeti ( ; Hungarian: "Ligeti György Sándor" , ] ; 28 May 1923 – 12 June 2006) was a Hungarian composer of contemporary classical music.
 He has been described as "one of the most important avant-garde composers in the latter half of the twentieth century" and "one of the most innovative and influential among progressive figures of his time".
N. Senada (which may be a play on "Ensenada", "en se nada" meaning "in himself nothing," "no sé nada" meaning "I don't know anything" or "enseñada", a form of the past participle meaning "taught"; N. may stand for "Nigel") was a Bavarian composer and music theorist who formulated the "Theory of Obscurity" and the "Theory of Phonetic Organization".
 There is a debate as to whether or not he existed, or was simply an invention of The Residents.
 Supposedly born in 1907 and dying in 1993 at the age of 86, Senada was one of The Residents' earliest collaborators, having arrived in San Mateo, California, with Philip Lithman.
 It is frequently speculated that, if real, N. Senada may have been the famous avant-garde composer and instrument-designer Harry Partch, the influence of whose work may be heard in Residents' compositions such as "Six Things to a Cycle"; his death is also referenced in the song "Death in Barstow".
Die Kluge.
 Die Geschichte von dem König und der klugen Frau ("The Wise [Girl].
 The Story of the King and the Wise Woman") is an opera in 12 scenes written by Carl Orff.
 It premiered in Frankfurt, Germany, on 20 February 1943.
 Orff referred to this opera as a "Märchenoper " (fairy tale opera).
 The composer also wrote the libretto, based on "Die Kluge Bauerntochter" ("The Peasant's Wise Daughter") from the Grimm's Fairy Tales.
 A performance lasts for about 90 minutes and is often paired with Orff's "Der Mond".
In 1933 the prolific inventor Robert Pauli Scherer (1906–1960) invented the rotary die encapsulation process, revolutionizing the soft-gelatin encapsulation field.
 He founded the R. P. Scherer Corporation to commercialize his invention.
 R.P. Scherer Corporation was acquired by Cardinal Health, Inc. in 1998, and was a significant part of the Pharmaceutical Technologies & Services segment.
 Several other businesses were acquired and subsequently spun out of R.P. Scherer Corporation, including Scherer Laboratories.
 The Pharmaceutical Technologies & Services segment of Cardinal Health was acquired by the Blackstone Group in 2007 and subsequently named Catalent Pharma Solutions.
Make Them Die Slowly is the second studio album by White Zombie, released on March 22, 1989 by Caroline Records.
 It is named after the 1981 cannibal movie "Cannibal Ferox", which was originally released in the US as "Make Them Die Slowly".
 There is a printing error on the CD's side saying "Let Them Die Slowly" instead of the album's correct title.
 Produced by composer Bill Laswell and featuring John Ricci on guitar, the album represented a transition from the noise rock influenced sound of the White Zombie's previous albums to heavy metal, which informed much of their later work.
Partholón (modern spelling: Parthalán) is a character in medieval Irish Christian pseudo-history.
 According to the tradition, he is the leader of the second group of people to settle in Ireland, the Muintir Partholóin (people of Partholón).
 They arrive on the uninhabited island about 300 years after Noah's Flood and are responsible for introducing such things as farming, cooking, brewing and buildings.
 After some years, they all die of plague in a single week.
 The tale is probably an invention of the Christian writers.
 'Partholón' comes from the Biblical name 'Bartholomaeus' or 'Bartholomew' and he may have been borrowed from a character of that name who appears in the Christian pseudo-histories of Saints Jerome and Isidore of Seville.
"Die Another Day" is the theme song from the James Bond film of the same name by American singer and songwriter Madonna.
 The song initially leaked into the internet in early October 2002 prior to the official release, prompting radio to play the track.
 It was released commercially as a single on October 22 by Maverick Records and was later included on the singer's ninth studio album, "American Life" (2003), and her greatest hits compilation, "Celebration" (2009).
 Following the release of the previous Bond single, "The World Is Not Enough", MGM wanted a high-profile artist for the theme of "Die Another Day" and Madonna was their choice.
 She wrote and produced the song with Mirwais Ahmadzaï while French composer Michel Colombier was enlisted as composer.
Louis François Dauprat (24 May 1781 in Paris – 16 July 1868 in Paris) was a French horn player, composer and music professor at the Conservatoire de Paris.
 He played and taught only natural horn, but was also very interested in the first experiments with keyed horns.
 He successfully ensured the development of a distinctively French school of playing, marginally influenced by the invention of the valve horn.
Invention is an early composition by Hungarian composer György Ligeti.
 It is scored for solo piano and was composed in 1948.