The Weimar years saw a flourishing of political and grotesque cabaret which, at least for the English-speaking world, has become iconic for the period through works such as "The Berlin Stories" by the English writer Christopher Isherwood, who lived in Berlin from 1929-33. The musical and then the film "Cabaret" were based upon Isherwood's misadventures at Nollendorfstrasse 17 in the Schöneberg district where he lived with cabaret singer Jean Ross. The main center for political cabaret was Berlin, with performers like comedian Otto Reutter. Karl Valentin was a master of grotesque cabaret.