The children's popular science film "Magic Sound" tells about the instrumental groups of the symphony orchestra. 1st and 2nd parts. The building of the Moscow Conservatory in the evening. Symphony orchestra on stage during the performance (sinhr.) Old engravings depicting violins, violinists, flutist, cellists, cavalry trumpeter, street musician and others. Workshop for the manufacture of stringed instruments. Master at work. Various musical instruments played by the musicians of the symphony orchestra: violins, clarinet, gobot, saxophone, French horn, trumpet, trombone, drums, xylophone, grand piano and others.