Garrett List (born 1943 in Phoenix, Arizona) is an American trombonist, vocalist and composer.
In 1950, he moved with his family to Southern California. At the age of 18, he already was busy teaching, playing and composing music (from classical and jazz to pop). In 1965 he left California and settled in New York, where he attended the famous Juilliard School of Music. There he encountered the Italian composer Luciano Berio and the conductor Dennis Russell Davies, with whom he formed the Juilliard Ensemble. This ensemble permitted him to meet Henri Pousseur and Pierre Boulez.
In the 1970s, he developed an interest in free jazz and met famous musicians such as John Cage, Frederic Rzewski, Steve Lacy and LaMonte Young. He was also a member of Musica Elettronica Viva. In 1981, Henri Pousseur invited him to found the improvisation class at the Conservatoire Royal de Musique de Liège, where he taught among others Fabrizio Cassol, Michel Massot and Aston Keaton alias Acétone He wrote pieces for Man Ray movies as well as for other artists such as Fernand Léger, Hans Richter and Paul Gonze.