Res Humanitariae

For the first time in Ukrainian and world musicology, based on previously unexplored archival materials, information on one of Yakiv Yatsynevych’s most popular works – arranging of the folk song “Susidka” has been reconstructed and supplemented. In the process of research in Central State Archives Museum of Literature and Arts of Ukraine (Kyiv) were found out many valuable sources. Among them, more than twenty letters which are the correspondence of composer’s wife – Iryna Yatsynevych with the musicologist Leonid Kaufman; a letter to I. Yatsynevych from her brother, Methodiy Pavlovsky and from the editorial office of the vocal literature of the State Musical Publishing House; articles from the periodicals and posters of concerts, which inform about the performance of the work, original musical manuscript of “Susidka”. As a result of work, all founded documents were included to scientific circulation. The materials give an opportunity to supplement the history of the creation of work, to determine its place in the stage life of the twentieth century, to find out the “detective” story by I. Yatsynevych about the appropriation of the composer’s work by another artist and to establish that Y. Yatsynevych’s “Susidka” is not just a processing of folk song, but almost original author’s composition.