Each exam item (a question with its possible answers) has at least two references to standard books or other sources of project management. Most of the questions reference the PMI A Guide to the Project Management Body of Knowledge (aka the PMBOK Guide).
The Rite of Spring (Le Sacre du Printemps) is a ballet in two parts. The entire ballet was a concept developed by Igor Stravinsky. He wrote the music. The set and costumes were designed by Nicholas Roerich.
That's exactly the case with The Rite of Spring. Igor Stravinsky wrote The Rite of Spring in 1913. It redefined 20th-century music, much as Beethoven's Eroica had transformed music a century before.