Completed in 1936 but withdrawn during rehearsal and not performed until 1961, the searing Fourth Symphony finds Shostakovich stretching his musical idiom to the limit in the search for a personal means of expression at a time of undoubted personal and professional crisis. The opening movement, a complex and unpredictable take on sonata form that teems with a dazzling profusion of varied motifs, is followed by a short, eerie central movement. The finale opens with a funeral march leading to a climax of seismic physical force that gives way to a bleak and harrowing minor key coda. The Symphony has since become one of the most highly regarded of the composer's large-scale works.