Paz was born in Buenos Aires, either in 1897 (Corrado 1999–2002) or in 1901 (Salgado 2001), where he studied piano with Roberto Nery and composition with Constantino Gaito and Eduardo Fornarini. He also studied organ with Jules Beyer, and then travelled to Paris to work with Vincent d'Indy at the Schola Cantorum (Salgado 2001).
On 22 October 1929, a shared enthusiasm for new musical developments caused him, together with Juan José Castro and José María Castro, Gilardo Gilardi, and Jacobo Ficher, to form the Grupo renovación, with the aim of promoting the cause of modern music in Argentina. In 1936, Paz left the group to found his own concert series, the Conciertos de la Nueva Música (Slonimsky 1945, 80–81).
Paz was firmly opposed to the folkloristic approach to music that was widespread in Latin America in the 1930s and 1940s (Slonimsky 1945, 97). Opinions differ about his earliest compositional styles. According to one authority, in the 1920s and early 1930s, his music was post-Romantic, with influences from César Franck and Richard Strauss (Salgado 2001); another writer describes this same period (1920–27) as characterized by neoclassical polyphony (Slonimsky 1945, 97). The former author regards Igor Stravinsky's neoclassicism and jazz as Paz's focus in the 1930s, whereas the latter describes his second period (1927–1934) as "marked by atonal melodic idiom and polytonal harmony" (Slonimsky 1945, 97). Both authors agree that in the 1930s he was investing the diverse styles and techniques prevalent worldwide at that time, and particularly Arnold Schoenberg's twelve-tone technique, which Paz introduced to Argentina (Slonimsky 1945, 97; Salgado 2001). He was particularly attracted by Anton Webern's music, and from 1934 adopted twelve-tone writing, which he continued to use until 1950. Though he continued to maintain that Schoenberg's methods deserved to be better-known and understood, publishing in 1954 a book Arnold Schoenberg, o el fin de la era tonal, he abandoned the technique in his own compositions, evolving a new experimental, highly structured idiom. In the mid-1960s, however, he gave up composing altogether (Salgado 2001).
- Corrado, Omar. 1999–2002. "Paz, Juan Carlos". Diccionario de la música española e hispanoamericana, 10 volumes, edited by Emilio Casares, José López-Calo, Ismael Fernández de la Cuesta, and María Luz González Peña. Madrid: Sociedad General de Autores y Editores. ISBN 9788480483117 ISBN 9788480483032.
- Salgado, Susana. 2001. "Paz, Juan Carlos". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
- Slonimsky, Nicolas. 1945. Music of Latin America. New York: Thomas Y. Crowell Company.
- Gilbert, Steven. 1973–74. "'The Ultra-Modern Idion': A Survey of New Music". Perspectives of New Music 12, Nos. 1–2 (Fall-Winter 1973/Spring-Summer 1974): 282–314.
- Juan Carlos Paz at Biografías y Vidas
- Juan Carlos Paz at Latinoamérica Música
- Juan Carlos Paz on IMDb
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