Moscow city. Composer K. Khachaturyan (nephew of A. I. Khachaturyan) at the piano composing music for one of the animated films. K. Khachaturian and cellist M. Rostropovich rehearse "Sonata for cello and piano" by composer K. Khachaturian, dedicated to M. Rostropovich. K. Khachaturyan (piano) and M. Rostropovich (cello) perform "Sonata for Cello and Piano" in the Small Hall of the Moscow State Tchaikovsky Conservatory. Among the audience in the hall are composers D. D. Shostakovich and A. N. Pakhmutova.