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In page Boris Godunov (opera):

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Shostakovich remembered Alexander Glazunov telling him how Mussorgsky himself played scenes from Boris at the piano. Mussorgsky's renditions, according to Glazunov, were brilliant and powerful—qualities Shostakovich felt did not come through in the orchestration of much of Boris.[3] Shostakovich, who had known the opera since his student days at the Saint Petersburg Conservatory, assumed that Mussorgsky's orchestral intentions were correct but that Mussorgsky simply could not realize them:[citation needed]