For a one-hit composer, we hear rather a lot of Pietro Mascagni. His reputation rests on his 1890 debut Cavalleria Rusticana, the one-act Sicilian shocker that’s usually yoked (not always to its advantage) to Leoncavallo’s Pagliacci. But in recent years we’ve also seen the cod-medieval car crash of Isabeau, and a couple of outings for Iris, an opera that fuses orientalist opulence with tentacle porn, but not in a good way.