In literature the main verismo writers were the Frenchman Émile Zola, the Norwegian dramatist Henrik Ibsen and the Italian writer Giovanni Verga. The composer Pietro Mascagni used a story by Verga for his opera Cavalleria rusticana. This was a short, one-act opera which became extremely popular. Several composers were inspired by it and wrote similar works. The only one of these which is still regularly performed is "Pagliacci" by Ruggero Leoncavallo. These two short operas are often performed on the same evening. They are known together as "Cav and Pag".