20th-century composers

Esteban Delgado Bernal (1910 in Sanlúcar de Barrameda – 1989 in Buenos Aires), stage name Esteban de Sanlúcar, was a Spanish flamenco guitarist and composer.
He began his musical career in private meetings and cabarets, later participating in theater companies with Pepe Marchena and Angelillo, among others. The last forty years of his life were spent in Latin America, Venezuela and Argentina, where he alternated his work as guitarist between teaching and composition. One of his early pupils in Spain was Manolo Yglesias. His works include Perfil Flamenco, El Castillo de Xauén, Aromas del Puerto, Primavera andaluza, Horizonte de Málaga, Mantilla de Feria and Panaderos Flamencos and Panaderos Flamencos II. Panaderos Flamencos and Perfil Flamenco in particular are perhaps his best-known compositions, and have become a part of the Flamenco guitar repertoire.

Guillaume Landré (24 February 1905 in The Hague – 6 November 1968 in Amsterdam) was a Dutch composer of operas, 4 symphonies, and chamber music. His father, Willem Landré (1874–1948) was also a composer; Guillaume studied under him. He also studied under Willem Pijper who had some influence on Landré's early works. Later in his career Landré experimented with serial techniques and jazz influences. From 1950 to 1962 he acted as chairman of the Dutch Society of Composers. In addition to composing he also studied and taught law.

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

Antonius Wilhelmus Adrianus de Leeuw (Rotterdam, 16 November 1926 - Paris, 31 May 1996) was a Dutch composer. He occasionally experimented with microtonality.