'What is Montmartre? Nothing. What must it be? Everything', proclaimed Rodolphe Salis in 1881, when his cabaret Le Chat Noir launched an entertainment boom in the 9th and 18th Arrondissements of Paris which would dominate the worlds of popular and high culture until the First World War. Montmartre's music-halls, circuses, cinemas, accompanied by extra frisson of crime and prostitution, coexisted with burgeoning art movements sprung from the cabarets,...