The film tells about the importance of musical instruments in the life of peoples of all continents: violin, viola, cello and related instruments. Violin masters: L. A. Gorshkov, D. V. Yarovoy, N. M. Frolov in the workshops for the assembly of violins. The Beethoven Quartet. Played by: violist F. Druzhinin, S. Shirinsky, violinists: D. Tsyganov, N. Zabavnikov. V. Borisovsky plays the viol d'amure. Tchaikovsky Competition at the Moscow Conservatory. V. Tretyakov is speaking. Jury members: L. Kogan, D. Oistrakh, D. Shostakovich. L. Kogan performs D. Shostakovich's violin concerto. Exhibition of musical instruments in the Museum of Leningrad. Showcases with violins of Soviet, Italian masters. Photographs of Soviet violin makers: E. Vitachek, T. Podgorny, G. Morozov, musicians: N. Shakhovskaya, N. Bochkova, Pikaisen, V. Klimov; programs of performances in America by V. Tretyakov, L. Kogan. A concert hall in Rome, a quarter of Montreal, the parliament building in Budapest, London, a temple in Japan, where Soviet musicians performed.