Klaipėdos universitetas

This article deals with undated and wrongly dated correspondence of Sergei Bortkiewicz. It presents the hypothetical dates of some letters and postcards as the result of previous studies by other scholars. Other incorrect dates have been corrected using postage stamps and the contents of letters. A description of every undated letter allows us to place them among the others. The article discusses controversial hypotheses, and refutes some of them. Several new hypotheses are put forward instead. Dates for three undated letters by Bortkiewicz are suggested for the first time.

The article deals with Sergei Bortkiewicz form, structure and functional experiments on sonata cycle in Sonata for Violin and Piano op. 26. The date of creation of the work is clarified. The article provides an overview of the history of development of the sonata cycle genre invariant. Comprehensive analysis of the work by Bortkiewicz provides tracing influences of West-European and Russian composing traditions. Different approaches to the interpretation of the composer’s idea are presented, which allows to explain the specific construction of the cycle.