Leonard Constant Lambert (August 23, 1905 – August 21, 1951) was a British composer and conductor. Lambert was the son of Russian-born Australian painter George Lambert. Educated at Christ's Hospital and the Royal College of Music, Lambert was a prodigy, writing orchestral works from the age of 13, and at 20 received a commission to write a ballet for Serge Diaghilev's Ballets Russes (Romeo and Juliet).

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