Question: Who was mentored by Arnold Schoenberg and worked on the album "At the Grave of Richard Wagner"?

full_context: Document 1: Second Viennese School: The Second Viennese School (German: Zweite Wiener Schule, Neue Wiener Schule ) is the group of composers that comprised Arnold Schoenberg and his pupils and close associates in early 20th century Vienna, where he lived and taught, sporadically, between 1903 and 1925. Their music was initially characterized by late-Romantic expanded tonality and later, following Schoenberg's own evolution, a totally chromatic expressionism without firm tonal centre, often referred to as atonality; and later still, Schoenberg's serial twelve-tone technique. Though this common development took place, it neither followed a common time-line nor a cooperative path. Likewise, it was not a direct result of Schoenberg's teaching—which, as his various published textbooks demonstrate, was highly traditional and conservative. Schoenberg's textbooks also reveal that the Second Viennese School spawned not from the development of his serial method, but rather from the influence of his creative example.
Document 2: At the Grave of Richard Wagner: At the Grave of Richard Wagner is a studio album by the Kronos Quartet, containing works by Alban Berg and Anton Webern, and a brief "romantic elegy" by Franz Liszt.
Document 3: New Venice School: The New Venice School is a movement in contemporary music in Venice from the 1970s to the present, made up of composers directly influenced from teachings at the Venice Conservatory (Conservatorio Benedetto Marcello) of the distinguished composer and pedagogue Baron Ernesto Rubin de Cervin (Albrizzi) (born 1936), who studied under Luigi Dallapiccola in Florence and Goffredo Petrassi in Rome. His many students include the composer and conductor Giuseppe Sinopoli (1946–2001); the composer and teacher Marino Baratello (born 1953); the composer Claudio Ambrosini (born 1948); and the Amsterdam-based, English composer Geoffrey King (born 1949). Although not directly influenced by the legacy of Rubin de Cervin and the above-listed lineage, other Venetian composers were influential in the development of new music in Venice, namely Bruno Maderna (1920–1973) and Luigi Nono(1924–1990).
Document 4: Héroïde funèbre (Liszt): Héroïde funèbre , S. 102, is a symphonic poem written by Franz Liszt in 1850 and published in 1857 as No. 8. The work originated as the first movement of a planned "Revolutionary Symphony" inspired by the July Revolution. Liszt pays homage in this programmatic symphonic poem to the soldiers and men that died fighting in revolutionary efforts. The composition of this piece was started in 1830 as a brief sketch for a full symphony, but was dropped by Liszt in the continuing of other works. However, in 1848, there was an uprising in Liszt's home country of Hungary. One of Liszt's friends was killed during this revolution, which caused Liszt to revisit his now 20 year old sketch of the Revolutionary Symphony, shortening it and forming the first movement into the commemorative Héroïde funèbre. Liszt said of the program, "In these successive wars and carnages, sinister sports, whatever be the colours of the flags which rise proudly and boldly against each other, on both sides they float soaked with heroic blood and inexhaustible tears. It is for Art to throw her ennobling veil over the tomb of the brave, to encircle with her golden halo the dead and dying, that they may be the envy of the living."
Document 5: Die Walküre: Die Walküre (The Valkyrie), WWV 86B, is a music drama in three acts by Richard Wagner with a German libretto by the composer. It is the second of the four works that form Wagner's cycle "Der Ring des Nibelungen" ("The Ring of the Nibelung").
Document 6: Arnold Schoenberg Choir: The Arnold Schoenberg Choir (German: "Arnold Schoenberg Chor" ) is a Viennese/Austrian choir which was founded 1972 by Erwin Ortner, who is still its artistic director. The choir has a high reputation both among conductors and among critics and the musical scene in general. All members of the choir have broad experience and expertise in vocal music; most of them have graduated from or are currently studying at the Vienna University of Music and Performing Arts. The choir is named after Viennese composer Arnold Schoenberg.
Document 7: Richard Strauss: Richard Georg Strauss (11 June 1864 – 8 September 1949) was a leading German composer of the late Romantic and early modern eras. He is known for his operas, which include "Der Rosenkavalier", "Elektra", "Die Frau ohne Schatten" and "Salome"; his Lieder, especially his "Four Last Songs"; his tone poems, including "Don Juan", "Death and Transfiguration", "Till Eulenspiegel's Merry Pranks", "Also sprach Zarathustra", "Ein Heldenleben", "Symphonia Domestica", and "An Alpine Symphony"; and other instrumental works such as "Metamorphosen" and his Oboe Concerto. Strauss was also a prominent conductor in Western Europe and the Americas, enjoying quasi-celebrity status as his compositions became standards of orchestral and operatic repertoire.
Document 8: Requiem (Henze): Hans Werner Henze composed the nine Sacred Concertos that comprise his Requiem over the course of three years from 1991 to 1993 on commissions from the London Sinfonietta, Suntory Corporation for the NHK Philharmonic, and Westdeutscher Rundfunk, Cologne. The first movement, "Introitus: Requiem Aeternam" was commissioned by the London Sinfonietta as part of a memorial concert for Artistic Director Michael Vyner who died on 20 October 1989. In addition to Henze, the London Sinfonietta also commissioned seven other prominent composers (Luciano Berio, Sir Harrison Birtwistle, Sir Peter Maxwell Davies, Toru Takemitsu, Oliver Knussen, and Nigel Osborne) to write works in Vyner's memory to make up the program which was performed on the 6 May 1990.
Document 9: Seven Early Songs (Berg): The Seven Early Songs ("Sieben frühe Lieder") (c. 1905 – 1908), are early compositions of Alban Berg, written while he was under the tutelage of Arnold Schoenberg. They are an interesting synthesis combining Berg's heritage of pre-Schoenberg song writing with the rigour and undeniable influence of Schoenberg. The writing very much carries with it the heritage of Richard Strauss (although the influences of a number of other composers can be discerned – Gustav Mahler and Hugo Wolf for example, as well as Claude Debussy's harmonic palette in evidence in "Nacht"), through the expansiveness of gesture and 'opening of new vistas,' and that of Richard Wagner. The songs were first written for a medium voice and piano; they were revised for high voice and orchestra in 1928.
Document 10: Anton Webern: Anton Friedrich Wilhelm (von) Webern (] ; 3 December 188315 September 1945) was an Austrian composer and conductor. Along with his mentor Arnold Schoenberg and his colleague Alban Berg, Webern was at the core among those within and more peripheral to the circle of the Second Viennese School, including Ernst Krenek and Theodor W. Adorno. As an exponent of atonality and twelve-tone technique, Webern exerted influence on contemporaries Luigi Dallapiccola, Křenek, and even Schoenberg himself. As a tutor, Webern guided and variously influenced Arnold Elston, Frederick Dorian (Friederich Deutsch), Matty Niël, Fré Focke, Karl Amadeus Hartmann, Philipp Herschkowitz, René Leibowitz, Humphrey Searle, Leopold Spinner, and Stefan Wolpe.
Document 11: Richard Wagner: Wilhelm Richard Wagner ( ; ] ; 22 May 181313 February 1883) was a German composer, theatre director, polemicist, and conductor who is primarily known for his operas (or, as some of his later works were later known, "music dramas"). Unlike most opera composers, Wagner wrote both the libretto and the music for each of his stage works. Initially establishing his reputation as a composer of works in the romantic vein of Weber and Meyerbeer, Wagner revolutionised opera through his concept of the "Gesamtkunstwerk" ("total work of art"), by which he sought to synthesise the poetic, visual, musical and dramatic arts, with music subsidiary to drama. He described this vision in a series of essays published between 1849 and 1852. Wagner realised these ideas most fully in the first half of the four-opera cycle "Der Ring des Nibelungen" ("The Ring of the Nibelung").
Document 12: Arnold Schoenberg: Arnold Franz Walter Schoenberg or Schönberg ( ; ] ; 13 September 187413 July 1951) was an Austrian composer, music theorist, and painter. He was associated with the expressionist movement in German poetry and art, and leader of the Second Viennese School. With the rise of the Nazi Party, Schoenberg's works were labelled degenerate music, because they were modernist, atonal and what even Paul Hindemith called "sonic orgies" and "decadent intellectual efforts". He emigrated to the United States of America in 1934.
Document 13: Theodor W. Adorno: Theodor W. Adorno ( ; ] ; born Theodor Ludwig Wiesengrund; September 11, 1903 – August 6, 1969) was a German philosopher, sociologist, and composer known for his critical theory of society.
Document 14: Carl Maria von Weber: Carl Maria Friedrich Ernst von Weber (18 or 19 November 1786 5 June 1826) was a German composer, conductor, pianist, guitarist and critic, and was one of the first significant composers of the Romantic school.
Document 15: A Survivor from Warsaw: A Survivor from Warsaw, Op. 46, is a cantata by the Los Angeles-based Austrian composer Arnold Schoenberg, written in tribute to Holocaust victims. The main narration is unsung; “never should there be a pitch” to its solo vocal line, wrote the composer.
ground_truth: Anton Webern