Question: Which of russian composer Igor Stravinsky's works was once conducted by Eduard Flipse, and featured avant-garde natured music?
Sentence (from "The Rite of Spring"): When first performed, at the Théâtre des Champs-Élysées on 29 May 1913, the avant-garde nature of the music and choreography caused a sensation and a near-riot in the audience.
Relevant evidence: Yes