Question: What genre does the performer of Music of 18 Musicians operate in?

full_context: Document 1: 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 2: 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 3: 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 4: It's Gonna Rain: It's Gonna Rain is a minimalist musical composition for magnetic tape written by Steve Reich in 1965. It lasts about 17 minutes and 50 seconds. It was Reich's first major work and a landmark in minimalism and process music.
Document 5: Clapping Music: Clapping Music is a minimalist piece written by Steve Reich in 1972. It is written for two performers and is performed entirely by clapping.
Document 6: 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 7: 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 8: The Desert Music: The Desert Music is a work of music for voices and orchestra composed by the minimalist composer Steve Reich. It is based on texts by William Carlos Williams and takes its title from his poetry anthology "The Desert Music and Other Poems". The composition consists of five movements, and in both its tempi and arrangement of thematic material, the piece is in a characteristic arch form (ABCBA). It was composed in 1983.
Document 9: 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 10: 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 11: Drumming (Reich): Drumming is a piece by minimalist composer Steve Reich, dating from 1970–1971. Reich began composition of the work after a short visit to Ghana and observing music and musical ensembles there, especially under the Anlo Ewe master drummer Gideon Alorwoyie. His visit was cut short after contracting malaria. K. Robert Schwarz describes the work as "minimalism's first masterpiece."
Document 12: 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 13: 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 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: Music for Mallet Instruments, Voices and Organ: Music for Mallet Instruments, Voices and Organ is a 1973 composition by American composer Steve Reich. The piece is scored for glockenspiels, marimbas, metallophone (vibraphone without resonators), women's voices, and organ, and runs about 17 minutes.
ground_truth: opera
sub_queries: Music for 18 Musicians >> performer Answer: Steve Reich
Steve Reich >> genre Answer: opera