Question: Who commissioned the 1919 ballet written by the creator of the role of the Can-Can Dancer in "La Boutique fantasque"?

Context paragraphs:
Billy the Kid (ballet): Billy the Kid is a 1938 ballet written by the American composer Aaron Copland on commission from Lincoln Kirstein.  It was choreographed by Eugene Loring for Ballet Caravan.  Along with "Rodeo" and "Appalachian Spring", it is one of Copland's most popular and widely performed pieces.  The ballet is most famous for its incorporation of several cowboy tunes and American folk songs and, although built around the figure and the exploits of Billy the Kid, is not so much a biography of a notorious but peculiarly appealing desperado as it is a perception of the pioneer West, in which a figure such as Billy played a vivid role.

Picasso and the Ballets Russes: Pablo Picasso and the Ballets Russes collaborated on several productions.  Pablo Picasso's Cubist sets and costumes were used by Sergei Diaghilev in the Ballets Russes's "Parade" (1917, choreography: Léonide Massine), "Le Tricorne" ("The Three-Cornered Hat") (1919, choreography: Massine), "Pulcinella" (1920, choreographer: Massine), and "Cuadro Flamenco" (1921, choreography: Spanish folk dancers).  Picasso also drew a sketch with pen on paper of "La Boutique fantasque" ("La course"), (1919, choreography: Massine).  and designed the drop curtain for "Le Train Bleu" (1924, choreography: Bronislava Nijinska), based on his painting, "Two Women Running on the Beach" ("The Race"), 1922.

Corroboree (ballet): Corroboree is a ballet written by Australian composer John Antill in the early 1940s.  The first full version of the score was completed in 1944 and it was first performed as a concert suite in 1946.  On 3 July 1950 it was performed as a ballet, at the Empire Theatre in Sydney, choreographed by Rex Reid, with dancers of the Melbourne-based National Theatre Ballet.

Aschenbrödel: Aschenbrödel ("Cinderella") is a ballet written by Johann Strauss II.  He had written all the principal parts of the ballet, and was intending to fill in the orchestration as time permitted.  However, Strauss died in 1899, and it was finished by composer Josef Bayer in 1900.

Jane Avril: Jane Avril (9 June 186817 January 1943) was a French can-can dancer made famous by Henri de Toulouse-Lautrec through his paintings.  Extremely thin, 'given to jerky movements and sudden contortions', she was nicknamed "La Mélinite", after an explosive.

Léonide Massine: Leonid Fyodorovich Myasin (Russian: Леони́д Фёдорович Мя́син ), better known in the West by the French transliteration as Léonide Massine (9 August [O.S. 28 July] 1896 15 March 1979), was a Russian choreographer and ballet dancer.  Massine created the world's first symphonic ballet, "Les Présages", and many others in the same vein.  Besides his "symphonic ballets," Massine choreographed many other popular works during his long career, some of which were serious and dramatic, and others lighthearted and romantic.  He created some of his most famous roles in his own comic works, among them the Can-Can Dancer in "La Boutique fantasque" (1919), the Hussar in "Le Beau Danube" (1924), and, perhaps best known of all, the Peruvian in "Gaîté Parisienne" (1938).

La Goulue: Louise Weber (13 July 1866, Alsace-Lorraine – 30 January 1929) was a French can-can dancer who performed under the stage name of La Goulue (] ; "the glutton").  She also was referred to as the Queen of Montmartre.

The Three-Cornered Hat: El sombrero de tres picos ("The Three-Cornered Hat" or "Le tricorne") is a ballet choreographed by Léonide Massine to music by Manuel de Falla, commissioned by Sergei Diaghilev and premiered complete in 1919.  It is not only a ballet with Spanish setting but one that also employs the techniques of Spanish dance (adapted and somewhat simplified) instead of classical ballet.

La Boutique fantasque: La Boutique fantasque, also known as "The Magic Toyshop" or "The Fantastic Toyshop", is a ballet in one act conceived by Léonide Massine, who devised the choreography for a libretto written with the artist André Derain, a pioneer of Fauvism.  Derain also designed the décor and costumes for the ballet.  Ottorino Respighi wrote the music based on piano pieces by Gioachino Rossini.  Its world premiere was at the Alhambra Theatre in London on 5 June 1919, performed by Sergei Diaghilev's Ballets Russes.

The Forbidden Rite: The Forbidden Rite is a 1962 Australian TV play.  It is a filmed ballet - the first ever ballet written in Australia exclusively for TV.

Supporting paragraphs: The Three-Cornered Hat Léonide Massine
Answer: Sergei Diaghilev