Leonard Constant Lambert was a British composer, conductor, and author. He was the founder and music director of the Royal Ballet, and he was a major figure in the establishment of the English ballet as a significant artistic movement.

The Royal Ballet is a British internationally renowned classical ballet company, based at the Royal Opera House in Covent Garden, London, England. The largest of the five major ballet companies in Great Britain, the Royal Ballet was founded in 1931 by Dame Ninette de Valois. It became the resident ballet company of the Royal Opera House in 1946, and has purpose-built facilities within these premises. It was granted a royal charter in 1956, becoming recognised as Britain's flagship ballet company.