Question: What genre of music did the composer of Triple Quartet compose?

full_context: Document 1: Four Compositions (Quartet) 1983: Four Compositions (Quartet) 1983 is an album by American saxophonist and composer Anthony Braxton recorded in 1983 for the Italian Black Saint label.
Document 2: The Cave of the Storm Nymphs: The Cave of the Storm Nymphs is a painting by British artist Edward Poynter, depicting three nude sirens or nymphs from Greek mythology that lure sailors to their deaths. Poynter painted two versions, one in 1902 and the other in 1903, with minor differences. The former is housed in the Norfolk's Hermitage Museum, and the latter is in the private collection of Sir Andrew Lloyd Webber. One of the depicted sirens is playing a golden stringed, tortoise-shell lyre, while the other two sirens rejoice amid the foundering ship, expecting to add to the cave’s treasure.
Document 3: New York Counterpoint: "New York Counterpoint for amplified clarinet and tape, or 11 clarinets and bass clarinet" is a 1985 minimalist composition written by American composer Steve Reich. The piece, intended to capture the throbbing vibrancy of Manhattan, is notable for its ability to imitate electronic sounds through acoustic instrumentation.
Document 4: Variations for Winds, Strings and Keyboards: Variations for Winds, Strings and Keyboards is an orchestral piece composed in 1979 by Steve Reich. The piece is scored for oboes, flutes, full brass (three trumpets, three trombones, and tuba), strings, pianos, and electric organs. "Variations" was Reich's first orchestral piece.
Document 5: Music for 18 Musicians: Music for 18 Musicians is a work of musical minimalism composed by Steve Reich during 1974–1976. Its world premiere was on April 24, 1976, at The Town Hall in New York City. Following this, a recording of the piece was released by ECM New Series in 1978.
Document 6: Triple Quartet: Triple Quartet is a piece written by Steve Reich in 1998. It was commissioned by and is dedicated to the Kronos Quartet, and was premiered by them on May 22, 1999 in the Kennedy Center, Washington DC.
Document 7: Octet/Music for a Large Ensemble/Violin Phase: The album consists of commissioned works by Steve Reich. "Music for a Large Ensemble" was commissioned by the Holland Festival, "Violin Phase" was an earlier work that dealt with repetition.
Document 8: Tabun Cave: The Tabun Cave is an excavated site located at Nahal Me'arot Nature Reserve, Israel and is one of Human Evolution sites at Mount Carmel, which were proclaimed as having universal value by UNESCO in 2012. The cave was occupied intermittently during the Lower and Middle Paleolithic (500,000 to around 40,000 years ago). In the course of this period, deposits of sand, silt and clay of up to accumulated in the cave. Excavations suggest that it features one of the longest sequences of human occupation in the Levant.
Document 9: Sextet (Reich): Sextet is a composition by Steve Reich. As the title indicates, it is written for an ensemble of six: four percussionists and two keyboardists. The percussionists play (at various times) three marimbas, two vibraphones, two bass drums, crotales, sticks, and tam-tam. Two percussionists double on piano during the opening "Pulse" section. The keyboardists play both pianos and synthesizers set to an electric organ sound. The piece was composed in 1984–1985 and is about 28 minutes in duration.
Document 10: Bertha (opera): Bertha is an opera in one act, with music by Ned Rorem to an English libretto by Kenneth Koch, an original work parodying Shakespeare's histories. Rorem wrote the work originally at the request of the Metropolitan Opera (Met) Studio in the 1960s, intended as an opera for children. However, the Met studio rejected the work. The work was premiered at Alice Tully Hall in New York City on November 25, 1973 with Beverly Wolff in the title role.
Document 11: The Cave (opera): The Cave is a multimedia opera in three acts by Steve Reich to an English libretto by his wife Beryl Korot. It was first performed in 1993 in Vienna by the Steve Reich Ensemble, conducted by Paul Hillier. The title "The Cave" refers to The Cave of the Patriarchs in Hebron, where Abraham and Sarah (and several other major religious figures) are buried.
Document 12: Double Sextet: Double Sextet is a composition by Steve Reich scored for two sextets of flute, clarinet, violin, cello, vibraphone and piano. It won the 2009 Pulitzer Prize for Music, the first for the composer. With funds from the Carnegie Hall Corporation, The Abe Fortas Memorial Fund of the John F. Kennedy Center for the Performing Arts, Liverpool Culture Company – European Capital of Culture 2008, The Modlin Center for the Arts at the University of Richmond, Orange County Performing Arts Center, The University of Cincinnati College-Conservatory of Music – Music 08 Festival the piece was commissioned in 2007 by Eighth Blackbird who performed its premiere in 2008, at the University of Richmond in Virginia.. The Liverpool Culture Company (Gordon Ross, music programme manager) was the only non-US commissioning organisation and hosted the rest-of-the-world premiere at St. George's Concert Room, Liverpool on the 21st of November 2008 as part of Liverpool's European Capital of Culture celebrations.
Document 13: Atlas (opera): Atlas is an opera in three acts composed by Meredith Monk who also wrote the libretto and choreographed the dances. It is scored for 18 voices and a small chamber orchestra which includes a shawm and a glass harmonica. The story is very loosely based on the life and writings of the explorer Alexandra David-Néel and is told primarily through wordless vocal sounds with brief interjections of spoken text in Mandarin Chinese and English. The opera was co-commissioned by Houston Grand Opera, the Walker Art Center in Minneapolis, and the American Music Theater Festival in Philadelphia. It premiered at Houston Grand Opera in February 1991, followed by performances that same year in Philadelphia and Minneapolis. It subsequently toured in the US and Europe and had its New York premiere in May 1992 at the Brooklyn Academy of Music.
Document 14: Holy Spirit Grotto: The Holy Spirit Grotto ("La Gruta del Espíritu Santo" in Spanish), also known as Corinto Cave, in Corinto, Morazán, El Salvador, is a registered national monument of petroglyphs. The cave is largely associated with the Xibalba legend. The archaeologist Wolfgang Haberland performed studies in the late 1970s indicating the art belongs to the pre-Classic stage of Mesoamerican civilization. The cave likely got its name due to the Mesoamerican association of caves with the underworld, meaning that they are "considered an entrance to the underground world governed by spirits and deities of death, disease, water, and fertility." The cave is an important cultural and religious site for the Lenca nation, forming part of their traditions and legends of the place where ancestors of Balam Colop parted (which is mentioned in the Popol vuh), according to their legends and traditions, is father of all Lenca people, given the association of caves with the underworld by Mesoamericans, the name of 'Holy Spirit Cave' is ironic and perhaps an attempt by early Spanish to "exorcise" the cave in El Salvador. The "holy" nature of this cave is further confirmed by a man named Don Argelio Alvarez, who happens to be one of its guardians. Roughly translated, he claims that the cave contains "something magical and inexplicable that inspires tranquility and peace." Many people from various religious groups also continue to visit the site and carry out ceremonies, such as what Don Argelio believed to have taken place in the cave many centuries ago. However, it is entirely possible that the cave was instead used for other means. A German scientist found some handcrafted arrows and knives made of obsidian within the cave, leading him to believe that it may have actually been a shelter for hunters instead.
Document 15: The House of Atreus Act I: The House of Atreus Act I, released in 1999, is the ninth studio album by the American heavy metal band Virgin Steele. It has the subtitle "A Barbaric-Romantic Opera". This album is the first part of a metal opera inspired by the Oresteia, a trilogy of Greek tragedies written by Aeschylus which concerns the end of the curse on the House of Atreus. The music was intended to be the soundtrack for theatrical shows, with actors impersonating the characters of the tragedy. The metal opera was actually performed under the name "Klytaimnestra - The House Of Atreus" in European theatres from 1999 to 2001, with the production of the Memmingen Opera House company and Landestheater Production.
ground_truth: opera
sub_queries: Triple Quartet >> composer Answer: Steve Reich
Steve Reich >> genre Answer: opera