This is the fourth (or fifth, depending on conduction and interpretation) movement of Dmitry Shostakovich’s Symphony no. 3, known as the Первомайская (“First of May”). This movement is the finale, entitled “Первое, в первое мая” (“First, on the first of May”). It is set to the words of poet Semyon Isaakovich Kirsanov, defending and advancing May Day, revolution, and the resistance of the Russian people.
For me it is reminiscent of Maurice Merleau-Ponty’s words, from Humanism and Terror (188): the movement is a reminder that
“the human world is an open or unfinished system…. [T]he same radical contingency which threatens it with discord also rescues it from the inevitability of disorder, and [so] prevents us from despairing of it.”