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In page Boris Godunov (opera):

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Shostakovich confined himself largely to reorchestrating the opera, and was more respectful of the composer's unique melodic and harmonic style. However, Shostakovich greatly increased the contributions of the woodwind and especially brass instruments to the score, a significant departure from the practice of Mussorgsky, who exercised great restraint in his instrumentation, preferring to utilize the individual qualities of these instruments for specific purposes. Shostakovich also aimed for a greater symphonic development, wanting the orchestra to do more than simply accompany the singers.[citation needed]