Otto Bahr Halvorsen (28 May 1872 –23 May 1923 ) was a Norwegian politician from the Conservative Party.
 He was Prime Minister of Norway from 1920 to 1921 and again in 1923 when he died in office.
Karl Vaino (Russian: Карл Генрихович Вайно , "Karl Genrihovich Vaino"; born 28 May 1923 in Tomsk, Russia) is a former Estonian SSR politician.
 From 1978 to 1988 he was the First Secretary of the Communist Party of Estonia.
 His grandson is Russian politician Anton Vaino.
Garth Angus Wheatley (28 May 1923 – 4 September 2001) was an English first-class cricketer active 1946–50 who played for Surrey and Oxford University.
 He was born in Twickenham; died in Uppingham.
William Bateman Hall FREng (28 May 1923 – 6 August 2003) was a British nuclear engineer, and emeritus professor at the University of Manchester.
Sir Anthony (James) Williams (28 May 1923 - 7 May 1990) was a British diplomat.
 He was Ambassador to Cambodia from 1970 to 1973, Ambassador to Libya from 1977 to 1980, and Ambassador to Argentina from 1980 to 1982; his term in Argentina was disrupted by the Falklands War.
Srimushnam Srinivasa Murthy (19 May 1923 – 24 November 2009) was a Gandhian Freedom Fighter and a kannada writer based in Bangalore.
 He was born on 19 May 1923 in Mysore to Srimushnam Rangacharya and Kaveri Bai.
 He has written many books in kannada, one of them being "Vedanta Samanvaya", which is a synthesis of the classic interpretations of Upanishads and Brahma Sutras by Ramanuja, Madhvacharya and Shankaracharya.
 He was an employee of Hindustan Aeronautics Limited.
He also served as General Secretary of the Hindustan Aircraft Employees' Association.
Rosario de Acuña Villanueva de la Iglesia, better known by the short name Rosario de Acuña and the masculine pseudonym used for her writings, Remigio Andrés Delafón (18505 May 1923) was a Spanish author of dramas, essays, short stories, and poetry.
 Born in Madrid, she wrote under the masculine pen name of Remigio Andres Delafon.
 In 1884, she became the first woman speaker in the Ateneo de Madrid.
 She was considered to be both controversial and a bold freethinker in her time.
 Her radical thinking and critique on many controversial subjects of religious dogmatism, atheistic approach, illegitimate births, civil marriage (with the eventuality of divorce) created serious controversies.
 Cited as the "first woman playwright to have a theater closed down", she died at her own home in Gijón, Asturias on 5 May 1923.
György Sándor Ligeti ( ; Hungarian: "Ligeti György Sándor" , ] ; 28 May 1923 – 12 June 2006) was a Hungarian composer of contemporary classical music.
 He has been described as "one of the most important avant-garde composers in the latter half of the twentieth century" and "one of the most innovative and influential among progressive figures of his time".
Troels Svane (born 1967) is a Danish cellist.
 He is a part of the Zapolski Quartet.
 He studied with David Geringas at the Lübeck Academy of Music in Germany.
 He graduated from the soloist class with distinction and the highest grade in all subjects.
 He was taught by Anner Bylsma, Frans Helmerson, Ralph Kirshbaum, György Ligeti, Yo-Yo Ma, Siegfried Palm, Boris Pergamenschikow, Mstislav Rostropovich, Daniil Shafran, Paul Tortelier and the Amadeus Quartet.
T. M. Thiagarajan (Tamil: டி.
 எம்.
 தியாகராஜன் ) (28 May 1923 – 27 June 2007) was a Carnatic vocalist and musicologist from Tamil Nadu in Southern India.
 He was awarded the Madras Music Academy's Sangeetha Kalanidhi in 1981.

Question: Who was Troels Svane taught by that was born 28 May 1923?
Answer: György Ligeti