In what way did Igor Stravinsky's ballet 'Petrushka' challenge traditional ballet assumptions?

The choice indicating that 'Petrushka' incorporates pieces of Russian folk songs highlights its significant departure from traditional ballet assumptions largely rooted in Western classical forms. Stravinsky draws upon the native musical idioms of Russia, infusing the score with elements that evoke the authentic sounds and rhythms of Russian culture. This blending of folk music with ballet was revolutionary as it not only offered a new auditory experience but also deepened the emotional and thematic resonance of the story.

By using folk melodies, Stravinsky was able to present a sense of national identity and cultural authenticity within the ballet, contrasting with the more universal, abstract musical language typically found in classical ballet. This incorporation of folk elements aligns with the broader movement towards nationalism in art during the early 20th century, where composers sought to reflect their national identities in their works, thereby enhancing the overall uniqueness and modernity of 'Petrushka.'