Theatre of Eternal Music in the context of "Just intonation"

La Monte Thornton Young (born October 14, 1935) is an American composer, musician, and performance artist recognized as one of the first American minimalist composers and a central figure in post-war avant-garde music. He is best known for his exploration of sustained tones, beginning with his 1958 composition Trio for Strings. His compositions have called into question the nature and definition of music, most prominently in the text scores of his Compositions 1960. While few of his recordings remain in print, his work has inspired prominent musicians across various genres, including avant-garde, rock, and ambient music.

Young played jazz saxophone and studied composition in California during the 1950s, and subsequently moved to New York in 1960, where he was a central figure in the downtown music and Fluxus art scenes. He then became known for his pioneering work in drone music (originally called dream music) with his Theatre of Eternal Music collective, alongside collaborators such as Tony Conrad, John Cale, and his wife, the multimedia artist Marian Zazeela. In 1964, he began work on his unfinished improvisatory composition The Well-Tuned Piano, iterations of which he has performed throughout subsequent decades.

Terrence Mitchell Riley (born June 24, 1935) is an American composer and performing musician best known as a pioneer of the minimalist school of composition. Influenced by jazz and Indian classical music, his work became notable for its innovative use of repetition, tape music techniques, improvisation, and delay systems. His best known works are the 1964 composition In C and the 1969 album A Rainbow in Curved Air, both considered landmarks of minimalism and important influences on experimental music, rock, and contemporary electronic music. Subsequent works such as Shri Camel (1980) explored just intonation.

Raised in Redding, California, Riley began studying composition and performing solo piano in the 1950s. He befriended and collaborated with composer La Monte Young, and later became involved with both the San Francisco Tape Music Center and Young's New York collective, the Theatre of Eternal Music. A three-record deal with CBS in the late 1960s brought his work to wider audiences. In 1970, he began intensive studies under Hindustani singer Pandit Pran Nath, whom he often accompanied in performance. He has collaborated frequently throughout his career, most extensively with chamber ensemble the Kronos Quartet and his son, guitarist Gyan Riley.

Anthony Schmalz Conrad (March 7, 1940 – April 9, 2016) was an American video artist, experimental filmmaker, musician, composer, sound artist, teacher, and writer. Active in a variety of media since the early 1960s, he was a pioneer of both drone music and structural film. As a musician, he was an important figure in the New York minimalist scene of the 1960s, during which time he performed as part of the Theatre of Eternal Music (along with John Cale, La Monte Young, Marian Zazeela, Terry Riley, and others). He became recognized as a filmmaker for his 1966 film The Flicker. He performed and collaborated with a wide range of artists over the course of his career.

John Davies Cale OBE (born 9 March 1942) is a Welsh musician, composer, and record producer who was a founding member of the American rock band the Velvet Underground. Over his six-decade career, Cale has worked in various styles in rock, drone, classical, avant-garde and electronic music.

John Cale studied music at Goldsmiths College before moving in 1963 to New York City, where he performed as part of the Theatre of Eternal Music and formed the Velvet Underground. Since leaving the band in 1968, Cale has released seventeen solo studio albums, including Paris 1919 (1973), Fear (1974) and Music for a New Society (1982). Cale has worked as a record producer on albums by artists including Nico, the Stooges, the Modern Lovers and Patti Smith.

Marian Zazeela (April 15, 1940 – March 28, 2024) was an American light artist, designer, calligrapher, painter, and musician based in New York City. She was a member of the 1960s experimental music collective Theatre of Eternal Music, and was known for her collaborative work with her husband, the minimalist composer La Monte Young.