Short answers, pulled from the story.
Sergei Prokofiev completed the Romeo and Juliet ballet score in September 1935. The work was commissioned by Adrian Piotrovsky and Sergey Radlov to follow the principles of drambalet.
The full Romeo and Juliet ballet premiered at the Mahen Theatre in Brno, Czechoslovakia on the 30th of December 1938. Prokofiev could not attend due to his outbound travel restrictions from the Soviet Union.
Galina Ulanova and Konstantin Sergeyev danced the title roles of Juliet and Romeo in the Leningrad production on the 11th of January 1940. Leonid Lavrovsky created the choreography for this significantly revised version which received international acclaim.
Sergei Prokofiev included a tenor saxophone within the standard orchestral instrumentation for this ballet. He also utilized mandolins to create a distinct Italianate atmosphere throughout the score along with cornets and viola d'amore.
Mark Morris created choreography for the world premiere of the reconstructed original ending on the 4th of July 2008. The Mark Morris Dance Group presented the work at Bard College in New York state following a year-long tour.