James Tenney (August 10, 1934 – August 24, 2006) was an American composer and influential music theorist.
Tenney was born in Silver City, New Mexico, and grew up in Arizona and Colorado. He attended the University of Denver, the Juilliard School of Music, Bennington College (B.A., 1958) and the University of Illinois (M.A., 1961). He studied piano with Eduard Steuermann and composition with Chou Wen-chung, Lionel Nowak, Paul Boepple, Henry Brant, Carl Ruggles, Kenneth Gaburo, Lejaren Hiller, John Cage, Harry Partch, and Edgard Varèse. He also studied information theory under Lejaren Hiller, and composed early computer music before turning almost completely to writing for instruments with the occasional tape delay, often using just intonation and alternative tunings. Tenney's notable students include John Luther Adams, John Bischoff, Peter Garland, Larry Polansky, Charlemagne Palestine, and Marc Sabat. See: List of music students by teacher: T to Z#James Tenney. He performed with John Cage, as well as with the ensembles of Harry Partch (in a production of Partch's The Bewitched in 1959), Steve Reich, and Philip Glass (the latter two in the late 1960s).