In this article I analyze the musical politics of the 1941 Soviet film Anton Ivanovich serditsya (Anton Ivanovich Is Upset), directed by Aleksandr Ivanovsky, original score by Dmitry Kabalevsky. The film tells the story of the musical "enlightenment" of the eponymous Anton Ivanovich Voronov, an old, stodgy organ professor who is interested only in the "serious" music of J.S. Bach. His daughter, Sima, however, wishes to become an operetta singer and falls in love with a composer of "light" music, Aleksey Mukhin, which upsets the professor greatly. Thanks to a miraculous intervention by Bach himself, Anton Ivanovich ultimately sees his error and accepts Muhkin, going so far as to perform the organ part in Mukhin's new symphonic poem. While largely a lighthearted and fun tale, the caricature and censure of another young, but veiled "formalist" composer, Kerosinov, reflects the darker side of contemporary Soviet musical aesthetics. In the way that it does and does not work out the uneasy relationship between serious, light, and formalist music, I argue that Anton Ivanovich serditsya realistically reflects the paradoxical nature of Soviet musical politics in the late 1930s. Alexander Ivanovsky's 1941 film Anton Ivanovich serditsya (Anton Ivanovich is Upset, hereafter AIS) tells the story of Anton Ivanovich Voronov (from voron, "raven"), a venerated professor at the conservatory who idolizes the music of "serious" composers, particularly J.S. Bach. 1 His earnestness is established from the very start: we first see him in deep contemplation and reverence performing Bach's somber Passacaglia and Fugue in C minor, BWV 582, which accompanies the film's opening credits. Anton Ivanovich becomes upset, however, when he learns that his angelic daughter Sima (short for Seraphima, "seraphim"), who is training to become a singer, prefers "lighter" musical fare. His anger boils over when she falls in love with the young composer Alexey Mukhin (from mukha, "fly"), who is just completing a new operetta in which Sima will take the lead role. The expected, and necessary, reconciliation occurs just before the end of the film when Anton Ivanovich is visited in a dream by Bach himself, who convinces the professor that all music can be good, so long as it is well crafted. The professor thus comes to terms with his daughter's love for light music (and for Mukhin) and agrees to perform the organ part in Mukhin's new symphonic poem, a rousing performance of which ends the film. The film is thus, ostensibly, a story "about the justification for the existence of the light genre in music." 2 But there are two other composers involved in the film who must also be taken into consideration. The first is an avant-gardist named Kerosinov (from kerosin, "kerosene"), who has been working on a "Physiological Symphony" for nine years and whose elitist attitude toward music is generally ridiculed 1 The film can be found online at https://youtu.be/sWQqNK_2BsM (accessed June 1, 2018).