Within the space of a few weeks we have had the rare chance of seeing the two great torsos of Russian opera, Borodin’s Prince Igor, unfinished because the composer was often otherwise engaged, and Musorgsky’s Khovanshchina, unfinished because its composer died of drink. Prince Igor at the Coliseum was musically magnificent, and dramatically utterly absurd, ‘self-parody’ that did not do justice to its low-jinks.