Question: Milan Sachs conducted the premiere of the play Jenůfa by the composer who was inspired by what types of music?

Context articles: Tritype
Ezio (Latilla)
The Last Supper (opera)
Leoš Janáček
Hollywood Chamber Orchestra
Symphony No. 9 (Vaughan Williams)
Jenůfa
Symphony No. 6 (Tchaikovsky)
Gnarly Buttons
Milan Sachs

The term Tritype refers to a theory regarding the Enneagram of Personality and was coined by Enneagram researcher and coach Katherine Chernick Fauvre.
 The word tritype was formed from Latin, with the prefix "tri" meaning three, and the word "type" added referring to the Enneagram types.
 The theory was initially inspired and developed as the result of research studies Fauvre conducted in 1994-1995 on the internal experience and personal image of the 9 types.
 Later, in 1996, Katherine met a teacher from Arica that referenced Oscar Ichazo's teachings on a similar theory that he referred to as the "tri-fix", but there was nothing published on Oscar Ichazo's "tri-fix" work.
 In December 1996 and January 1997, Enneagram Monthly published an interview with Oscar Ichazo that included the concept of tri-fix.
 This validated Fauvre's research findings that individuals have not just one, but 3 Enneagram types.
 In 2008, Fauvre coined the term Tritype in order to distinguish the Fauvres' vast research and resulting theory from both Ichazo’s teachings, as well as from the teachings of Arica.
Ezio is an opera eroica or "heroic" opera in 3 acts by Gaetano Latilla.
 The opera uses an Italian-language libretto by Pietro Metastasio.
 Metastasio's libretto was partly inspired by Jean Racine's play "Britannicus" and had earlier been set to music by George Frideric Handel in 1732.
 The work's protagonist is the fifth-century AD Roman general Flavius Aetius (Ezio in Italian), returned from his victory over Attila.
 Latilla's version premiered at the Teatro di San Carlo in Naples on 10 July 1758.
 The composer both directed and conducted the production and Vincenzo Re designed the sets used in the premiere.
 The cast included Giovanni Carestini in the title role, Caterina Gabrielli as Fulvia, Maddalena Galli as Onoria, Caterina Galli as Valentiniano III, Gregorio Babbi as Massimo, and Antonio Ambrogi as Varo.
The Last Supper is an opera with music by Sir Harrison Birtwistle to an English and Latin libretto by Robin Blaser.
 Birtwistle composed the music over the period written in 1998-1999.
 The world premiere was given by the Berlin State Opera on 18 April 2000, with the production directed by Martin Duncan and conducted by Daniel Barenboim.
 It was subsequently performed by the Glyndebourne Touring Opera in October/November 2000 and the following summer at the 2001 Glyndebourne Festival.
 Many of the original cast returned for two concert performances at the Piccolo Teatro Studio Expo, Milan and the Teatro Valdocco, Turin on 4-5 September 2008 with the London Sinfonietta, conducted by Elgar Howarth as part of the Settembre Musica festival.
Leoš Janáček (] , baptised Leo Eugen Janáček; 3 July 1854 – 12 August 1928) was a Czech composer, musical theorist, folklorist, publicist and teacher.
 He was inspired by Moravian and other Slavic folk music to create an original, modern musical style.
The Hollywood Chamber Orchestra (HCO) is an American orchestra based in Los Angeles, California, and founded in 2015 by musicians Noah Gladstone and Mark Robertson, who are also co-music directors.
 Its first public performance was on August 8, 2015, at the Colburn School's Zipper Hall.
 The program consisted of all horn concertos and was presented by the 2015 International Horn Society.
 Included on the program was the world premiere of Brad Warnaar's horn concerto, conducted by the composer and performed by Andrew Bain, the principal horn player of the Los Angeles Philharmonic.
 Their first public ticketed concert occurred on December 11, 2015, at the Montalban Theater in Hollywood, featuring Vivaldi's Four Seasons, performed by Los Angeles Philharmonic concertmaster Martin Chalifour.
 Other soloists appearing over the last 12 months have included violinist Sarah Chang, pianist Molly Morkoski, clarinetist Eddie Daniels, and singers Cindy O'Connor, Tyler Duncan, Eleni Matos, Garth Neustadter, Franchesca Retford, and Holly Sedillos.
 Subsequent concerts have included Star Trek:The Ultimate Voyage Tour at the Pantages Theatre, conducted by Justin Freer; and the world premiere of the concert version of the documentary film Blackfish at the Montalban Theater, conducted by composer Jeff Beal.
 On July 24, 2016, the HCO commissioned and premiered seven new works by composers Michael Barry, Chad Cannon, Andy Forsberg, John Kaefer, Brian Langsbard, Susie Benchasil Seiter, and Andrew Morgan Smith.
The Symphony No. 9 in E minor was the last symphony written by the British composer Ralph Vaughan Williams.
 He composed it from 1956 to 1957 and it was given its premiere performance in London by the Royal Philharmonic Orchestra conducted by Malcolm Sargent on 2 April 1958, in the composer's eighty-sixth year.
 It was subsequently performed on 5 August 1958 by the BBC Symphony Orchestra under the direction of Malcolm Sargent at a Promenade Concert.
 Vaughan Williams died three weeks later, on 26 August, the very day on which the symphony was due to be recorded for the first time, by the London Philharmonic Orchestra conducted by Sir Adrian Boult.
 The composer had planned to attend the recording sessions.
Jenůfa    (Její pastorkyňa, "Her Stepdaughter" in Czech) is an opera in three acts by Leoš Janáček to a Czech libretto by the composer, based on the play "Její pastorkyňa" by Gabriela Preissová.
 It was first performed at the Brno Theater, Brno, 21 January 1904.
 It was written between 1896 and 1902, and counts among the first operas written in prose.
The Symphony No. 6 in B minor, Op. 74, Pathétique is Pyotr Ilyich Tchaikovsky's final completed symphony, written between February and the end of August 1893.
 The composer entitled the work "The Passionate Symphony", employing a Russian word, Патетическая ("Pateticheskaya"), meaning "passionate" or "emotional", that was then mistranslated into French as "pathétique", "evoking pity", yet the mistranslation survived subsequent productions in every country but Russia.
 The composer led the first performance in Saint Petersburg on 16/28 October of that year, nine days before his death.
 The second performance, conducted by Eduard Nápravník, took place 21 days later, at a memorial concert on 6/18 November.
 It included some minor corrections that Tchaikovsky had made after the premiere, and was thus the first performance of the work in the exact form in which it is known today.
 The first performance in Moscow was on 4/16 December, conducted by Vasily Safonov.
 It was the last of Tchaikovsky's compositions premiered in his lifetime; his last composition of all, the single-movement 3rd Piano Concerto, Op. 75, which was completed in October 1893, a short time before his death, received a posthumous premiere.
Gnarly Buttons is a composition for solo clarinet and chamber ensemble by the American composer John Adams.
 The London Sinfonietta and Present Music (Milwaukee, Wisconsin) co-commissioned the work.
 The work received its premiere at the Queen Elizabeth Hall in London on October 19, 1996 with the London Sinfonietta, Michael Collins as solo clarinetist and the composer conducting.
 The work received its first Proms performance on 23 July 1998, conducted by Markus Stenz.
 The New York City premiere was in October 1997, with David Shifrin as the clarinet soloist and Ransom Wilson conducting musicians of the Chamber Music Society of Lincoln Center.
Milan Sachs (28 November 18844 August 1968) was a Czech-Croatian opera conductor and composer, who was long associated with the Zagreb Opera in Croatia, where he conducted some important local premieres, including Wagner's "Parsifal", and Janáček's "Jenůfa" (1920).