The Bolt, Op. 27, is a ballet music score written by Dmitri Shostakovich between 1930 and 1931.
The ballet is an ironic tale of slovenly work in a Soviet factory. The lazy Lyonka hates work, and together with a local priest and anti-Soviet plotter, he plans to sabotage the machinery by putting a bolt in it. Their plan is foiled by a group of Young Communists. The premiere was the only performance for 74 years, as the audience jeered it and the critics upbraided it for its un-Soviet intentions.