Monteux, Pierre (pyĕr môNtöˈ) [key], 1875–1964, French-American conductor, studied at the Paris Conservatory. As conductor (1911–14) of Diaghilev's Ballets Russes, he directed the premieres of ballets by Stravinsky, Ravel, and Debussy. He came to the United States in 1916 to conduct the Ballets Russes on its American tour, and he remained for two seasons at the Metropolitan Opera, New York City, and with the Boston Symphony Orchestra from 1919 to 1924. For the next 10 years he appeared as guest conductor of the Amsterdam Concertgebouw Orchestra. He became conductor of the Paris Symphony Orchestra in 1930 and of the San Francisco Symphony Orchestra in 1936. In 1942 he became a U.S. citizen. From 1961 until his death Monteux led the London Symphony Orchestra. He was known for the purity and self-restraint of his interpretations.