They were the worldâ s most famous ballet group . Their director Diaghilev asked Ravel to write a ballet for them Ravel took about three years to compose the music for Daphnis et ChloÃ . Ravel began work with impresario Sergei Diaghilev during 1909 for the ballet Daphnis et ChloÃ commissioned by Diaghilev with the lead danced by the famous ballet dancer and choreographer , Vaslav Nijinsky .