Question: Gerald Moore CBE (30 July 1899 – 13 March 1987) was an English classical pianist best known for his career as an accompanist for many famous musicians, among those with whom he was closely associated were which German soprano, and was among the foremost singers of lieder, and was renowned for her performances of Viennese operetta?

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Geoffrey Parsons (pianist): Geoffrey Penwill Parsons AO OBE (15 June 192926 January 1995) was an Australian pianist, most particularly notable as an accompanist to singers and instrumentalists.  After the retirement of Gerald Moore, he was generally considered the world's finest and most sympathetic accompanist of lieder singers, "elevating the role of the accompanist to new heights with his musicality, authority and quiet strength of playing".

Coenraad V. Bos: Coenraad Valentijn Bos (7 December 18755 August 1955) was a Dutch pianist, most notably as an accompanist to singers of lieder.  His peers such as Gerald Moore considered him the doyen of accompanists in his day.

Ernest Lush: Ernest Lush (23 January 190812 May 1988) was an English classical pianist who was best known as an accompanist.

Sebastian Peschko: Sebastian Peschko (30 October 1909 – 29 September 1987) was a German classical pianist specialised in the art form of lieder and as such was partner to some of the foremost lyrical singers of the 20th century.

Christopher Glynn: Christopher Glynn (born 5 September 1974) is an English classical pianist and festival director.  He is especially noted for his work as an accompanist with many leading classical singers.  He is also Artistic Director of the Ryedale Festival.

Albin Swoboda, Sr.: Albin August Heinrich Emil Swoboda (13 November 1836 – 5 August 1901) was an Austrian operatic tenor, actor, and opera director of German birth.  One of the most famous opera singers of the "Golden Age" of Viennese operetta, he was a leading tenor and dramatic stage actor at the Theater an der Wien from 1859-1878.  He notably appeared in the world premieres of operettas by composers Jacques Offenbach, Johann Strauss II, and Franz von Suppé.  He also appeared in musical comedies and plays in Vienna, and appeared in stage productions of all kinds as a guest artist in theatres in Germany, Hungary, Poland, and Russia.  His son Albin Swoboda, Jr. also had a successful career as an opera singer.  In 1955 a street in the Hietzing district of Vienna was named after him.

Lotte Lehmann: Charlotte "Lotte" Lehmann (February 27, 1888 – August 26, 1976) was a German soprano who was especially associated with German repertory.  She gave memorable performances in the operas of Richard Strauss, Richard Wagner, Ludwig van Beethoven, Puccini, Mozart, and Massenet.  The Marschallin in "Der Rosenkavalier", Sieglinde in "Die Walküre" and the title-role in "Fidelio" are considered her greatest roles.  During her long career, Lehmann also made more than five hundred recordings.  Her performances in the world of Lieder are considered among the best ever recorded.

Gerald Moore: Gerald Moore CBE (30 July 1899 – 13 March 1987) was an English classical pianist best known for his career as an accompanist for many famous musicians.  Among those with whom he was closely associated were Dietrich Fischer-Dieskau, Elisabeth Schumann, Hans Hotter, Elisabeth Schwarzkopf, Victoria de los Ángeles and Pablo Casals.

Elisabeth Schwarzkopf: Dame Olga Maria Elisabeth Friederike Schwarzkopf, DBE (9 December 19153 August 2006) was a German soprano.  She was among the foremost singers of lieder, and was renowned for her performances of Viennese operetta, as well as the operas of Mozart, Wagner and Richard Strauss After retiring from the stage, she was a voice teacher internationally.  She is considered one of the greatest sopranos of the 20th Century.

Dietrich Fischer-Dieskau: Dietrich Fischer-Dieskau (28 May 192518 May 2012) was a German lyric baritone and conductor of classical music, one of the most famous Lieder (art song) performers of the post-war period, best known as a singer of Franz Schubert's Lieder, particularly ""Winterreise"" of which his recordings with accompanist Gerald Moore and Jörg Demus are still critically acclaimed half a century after their release.

Supporting paragraphs: Gerald Moore Elisabeth Schwarzkopf
Answer: Olga Maria Elisabeth Friederike Schwarzkopf