Abstract: The research subject is Beethoven’s view of life of the late period - the topical issue for a performing musician: without understanding of the fundamental changes in his style, it is impossible to adequately interpret the late piano sonatas. The last of them - Sonata op.111 - has been an object of discussion not only among musicians, but also among writers for almost two centuries. The author detects the following types of dialogue in Sonate op.111: a) a dialogue with Beethoven’s previous compositions; b) a dialogue - within the latest period - with Ninth Symphony op.25 and Missa Solemnis op.123; c) a dialogue with the music of predecessors; d) an imaginary dialogue of Beethoven and Goethe (of the period of “Faust” completion); e) a dialogue op.111 with the world culture. The author arrives at the following conclusions: whilst the formation of the concept of interpretation is usually related to the performance activities of romanticists - Paganini and List, the prerequisites of the phenomenon of interpretation can be found already in the works and ideas of Beethoven - he is a precursor of romanticists of the 19th century. Each of his works is individualized, and doesn’t contain patterns or cliches. To play his compositions outside of the concept means to be not able to adequately convey the spirit of Beethoven’s music. With all their strict architectonics, Beethoven’s works appeal to spontaneity of self-expression - a pianist, as an actor, should experience this music “in the here and now”.