Unfinished opera in 5 acts by Mussorgsky to lib. by composer and V. Stasov. Comp. 1873. Completion and orch. by Rimsky‐Korsakov, prod. St Petersburg 1886 and 1911; Paris and London 1913 in version altered by Stravinsky and Ravel; Philadelphia 1928. Later completed by Shostakovich (1959), prod. Leningrad 1960.