20th-century conductors (music)

Erling Asbjørn Kjellsby (7 July 1901 - 20 February 1976) was a Norwegian organist and composer.

Karl Søren Clausen (15 August 1904 – 5 December 1972) was a Danish pianist, conductor, composer and musicologist. In addition to his work as a high school teacher in German and Music, he composed several instrumental and choral works, as well as songs. He became increasingly involved in work with amateur choirs and school singing, and he became a very popular choir conductor, who led several choirs to many musical successes, often with his own choir arrangements, based on folk melodies.
The strong folk singing tradition that he experienced in his childhood Sønderjylland under German rule became decisively influential during his later career. In the late 1940s he began collecting sound recordings of folk singing in marginal, rural areas of Jylland, and in the 1960s he continued this work in the isolated Faroe Islands in the North Atlantic. Alongside teaching and collection work, Clausen also began studying the history of Danish and North German folk singing, and put folk singing into a new context, incorporating historical, religious and sociological aspects, as reflected in various articles, as well as a textbook.

Richard (or Rijk) Hol (23 July 1825, in Amsterdam – 14 May 1904, in Utrecht) was a Dutch composer and conductor, based for most of his career at Utrecht. His conservative music showed the influence of Ludwig van Beethoven, Felix Mendelssohn, and Robert Schumann and the Leipzig school, though as a conductor he offered Dutch audiences the more revolutionary music of Hector Berlioz and Richard Wagner.

Arvid Fladmoe (8 May 1915 – 18 November 1993) was a Norwegian composer and conductor. He was particularly known for his work as conductor of opera and operetta.

Torstein Eliot Berg Grythe (24 November 1918 – 1 May 2009) was a Norwegian choir leader.
He was born in Kristiania as a son of tailor Endre Grythe (1882–1955) and Asta Berg (1897–1978). He enrolled in violin studies at the Norwegian Academy of Music in 1927, and joined the boys' choir Olavsguttene in 1928 and Oslo Domkor in 1932. He became vice conductor under Arild Sandvold. In 1940 he started the boys' choir Sølvguttene ("The Silver Boys"). During the occupation of Norway by Nazi Germany he was arrested on 29 November 1943 and was imprisoned in Grini concentration camp until 23 December. In August 1946 he married civil servant Eva-Marie Lindegaard.Sølvguttene was ultimately organized in relation to Operation Weserübung. Grythe had played the viola in the Norwegian Broadcasting Corporation radio orchestra since 1937. In 1951 he was appointed as conductor of the Norwegian Broadcasting Corporation boys' choir, founded in 1947. The choir was incorporated into Sølvguttene in 1967, and conducted the choir until 2004.He also conducted other choirs, including the Bondeungdomslaget men's choir in 1952 and the Norwegian Student Choral Society from 1973 to 1976. He was a music teacher at Foss Upper Secondary School from 1955 to 1972 and at Oslo Teachers' College from 1972 to 1987.He was decorated with The King's Medal of Merit in gold, the Medal of St. Hallvard and the Royal Norwegian Order of St. Olav. He received silver and gold records, the Spellemann Honorary Award in 1990, and the Gammleng Prize in 1996.

Aníbal Carmelo Troilo (11 July 1914 – 18 May 1975), also known as Pichuco, was an Argentine tango musician.
Troilo was a bandoneon player, composer, arranger, and bandleader in Argentina. His orquesta típica was among the most popular with social dancers during the golden age of tango (1940–1955), but he changed to a concert sound by the late 1950s.
Troilo's orchestra is best known for its instrumentals, though he also recorded with many well-known vocalists such as Roberto Goyeneche, Edmundo Rivero and Francisco Fiorentino. His rhythmic instrumentals and the recordings he made with vocalist Francisco Fiorentino from 1941 to 1943, known as milongas, were some of the favourites in tango salons. The renowned bandoneonist Astor Piazzolla played in and arranged for Troilo's orquesta típica during the period of 1939–1944.

Gerónimo Giménez y Bellido (10 October 1854 – 19 February 1923) was a Spanish conductor and composer, who dedicated his career to writing zarzuelas, such as La tempranica and La boda de Luis Alonso. He preferred to spell his first name with a "G", even though his name at birth officially began with a "J".
Written in Spanish, a very comprehensive biographical exposition by Ascensión García de las Mozas may be found at the Universidad de Cádiz institutional repository of Research and Learning Objects (RODIN)
https://rodin.uca.es/bitstream/handle/10498/7788/33195031.pdf?sequence=1

Jan Willem van Otterloo (27 December 1907 – 27 July 1978) was a Dutch conductor, cellist and composer.

Othmar Schoeck (1 September 1886 – 8 March 1957) was a Swiss Romantic classical composer, opera composer, musician, and conductor.
He was known mainly for his considerable output of art songs and song cycles, though he also wrote a number of operas, notably his one-act Penthesilea, which was premiered at the Semperoper in Dresden in 1927 and revived at the Lucerne Festival in 1999. He wrote a handful of instrumental compositions, including two string quartets and concertos for violin (for Stefi Geyer, dedicatee also of Béla Bartók's first concerto), cello and horn.