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For his new productions, Diaghilev commissioned the foremost composers of the 20th century, including: Debussy, Milhaud, Poulenc, Prokofiev, Ravel, Satie, Respighi, Stravinsky, de Falla, and Strauss. He was also responsible for commissioning the first two significant British-composed ballets: Romeo and Juliet (composed in 1925 by nineteen-year-old Constant Lambert) and The Triumph of Neptune (composed in 1926 by Lord Berners).

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The impresario also engaged conductors who were or became eminent in their field during the 20th century, including Pierre Monteux (1911–16 and 1924), Ernest Ansermet (1915–23), Edward Clark (1919–20) and Roger Désormière (1925–29).

 

Igor Stravinsky

Diaghilev hired the young Stravinsky at a time when he was virtually unknown to compose the music for The Firebird, after the composer Anatoly Lyadov proved unreliable, and this was instrumental in launching Stravinsky's career in Europe and the United States of America.

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Stravinsky's early ballet scores were the subject of much discussion. The Firebird (1910) was seen as an astonishingly accomplished work for such a young artist (Debussy is said to have remarked drily: "Well, you've got to start somewhere!"). Many contemporary audiences found Petrushka (1911) to be almost unbearably dissonant and confused. The Rite of Spring (1913) nearly caused an audience riot. It stunned people because of its willful rhythms and aggressive dynamics. The audience's negative reaction to it is now regarded as a theatrical scandal as notorious as the failed runs of Richard Wagner's Tannhäuser at Paris in 1861 and Jean-Georges Noverre's Les Fêtes Chinoises in London on the eve of the Seven Years' War. However, Stravinsky's early ballet scores are now widely considered masterpieces of the genre.