Kurt Weill was a completely groundbreaking composer in that he, along with Bertolt Brecht developed the characteristic cabaret style (Song) inspired by the American jazz music, minstrel shows and vaudeville with influences from Jewish klezmer music. Tango often played a major role, even in his operas. Often Weill sought after a Verfremdungseffekt, by using odd chords for the key, achieving a kind of desolation and unpleasant feeling.