Although Pietro Mascagni’s Cavalleria rusticana and Ruggero Leoncavallo’s Pagliacci are entirely separate operas, they are so frequently performed together that ‘Cav and Pag’ is now a standard phrase in the operatic world. In some ways it is easy to see why it has become a tradition to pair the two. Written only two years apart, in 1890 and 1892 respectively, their short running times mean they can comfortably fit into one evening, and together they seem to...