Modest Mussorgsky's 'Boris Godunov', based on Pushkin's eponymous Demetrius drama, is one of the operas raising the question about their definitive version. After the 'first Boris' was rejected in 1868-69, the work was revised into the 'original Boris' with the help of Mussorgsky's friend Nikolay Rimsky-Korsakov, which is the version on which the present book is based.Apart from the libretto, this edition contains introductory commentaries of Kurt Pahlen who also adds information on the composit...