The film tells about the scientist L. S. Termen who created an electro-musical instrument - the theremin. The inventor is at his device, the museum hall where the theremin is kept, dancing in one of the halls, a singer performing, boarding a bus, the building of the Lomonosov Moscow State University, a man playing the theremin, the Space pavilion at the Exhibition of Achievements of the National Economy, L. S. Termen passes along the street, rides on the bus.