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"): The Rite of Spring (French: Le Sacre du printemps ; Весна священная, "Vesna svyashchennaya", "sacred spring" ) is a ballet and orchestral concert work by the Russian composer Igor Stravinsky.
Relevant evidence: No