Question: Bethany Beardslee has performed classical music by which Austrian composer and theorist?

Bethany Beardslee (born December 25, 1925) is an American soprano particularly noted for her collaborations with major 20th-century composers, such as Igor Stravinsky, Milton Babbitt, Pierre Boulez, George Perle, Sir Peter Maxwell Davies and her performances of great contemporary classical music by Arnold Schoenberg, Alban Berg, Anton Webern.  Her legacy amongst midcentury composers was as a "composer's singer"—for her commitment to the highest art of new music.  Milton Babbitt said of her "She manages to learn music no one else in the world can.  She can work, work, work."  In a 1961 interview for Newsweek, Beardslee flaunted her unflinching repertoire and disdain for commercialism: "I don't think in terms of the public... Music is for the musicians.  If the public wants to come along and study it, fine.  I don't go and try to tell a scientist his business because I don't know anything about it.  Music is just the same way.  Music is "not" entertainment." <SEP> Philomel, a serial composition composed in 1964, combines synthesizer with both live and recorded soprano voice.  It is Milton Babbitt’s best-known work and was planned as a piece for performance at the Metropolitan Museum of Art, funded by the Ford Foundation and commissioned for soprano Bethany Beardslee.  Babbitt created "Philomel" in the Columbia-Princeton Electronic Music Center, of which he was a founding member. <SEP> 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. <SEP> Musical composition can refer to an original piece of music, either a song or an instrumental music piece, the structure of a musical piece, or the process of creating or writing a new song or piece of music.  People who create new compositions are called composers in classical music.  In popular music and traditional music, the creators of new songs are usually called songwriters; with songs, the person who writes new words for a song is the lyricist.  "Composition" is the act or practice of creating a song or other piece of music.  In many cultures, including Western classical music, the act of composing typically includes the creation of music notation, such as a sheet music "score", which is then performed by the composer or by other instrumental musicians or singers.  In popular music and traditional music, songwriting may involve the creation of a basic outline of the song, called the lead sheet, which sets out the melody, lyrics and chord progression.  In classical music, orchestration (choosing the instruments of a large music ensemble such as an orchestra which will play the different parts of music, such as the melody, accompaniment, countermelody, bassline and so on) is typically done by the composer, but in musical theatre and in pop music, songwriters may hire an arranger to do the orchestration.  In some cases, a pop or traditional songwriter may not use written notation at all, and instead compose the song in her mind and then play, sing and/or record it from memory.  In jazz and popular music, notable sound recordings by influential performers are given the weight that written or printed scores play in classical music.