Documents of the personal fund of B.R. Keilman's as a historical source on the history of the development of the national author's song

The article is devoted to the analysis of typewritten and autograph documents, as well as media materials of B.R. Keilman's personal archive fund, stored in the Samara Regional State Archive of Socio-Political History. The article reveals the importance and uniqueness of these archival materials, the use of which is necessary for the study of the national author's song. The paper considers the features of each type of sources, reveals their information and research potential. The specifics of each document and its content taken for analysis are determined. Special attention is paid to the representativeness of each group of sources taken for further study of the history of the author's song.