On 29 May 1913 a new ballet by Stravinsky called "The Rite of Spring" was performed at the Théâtre des Champs-Elysées in Paris. It was an absolute sensation. Some people loved it and others hated it. There was a big fight in the theatre and the police were called in. People were shouting so much that no one could hear the music. Stravinsky became ill afterwards and spent some weeks to recover. When the ballet was performed again people were quieter and listened to the music. There were lots of new ideas in the music: harsh chords and very complicated rhythms. The music of "The Rite of Spring" had an great influence on the development of music in the 20th century.