The article studies history of formation and defines the main priorities in the activity of “the Union of the Ukrainian Professional Musicians in Lviv” during 1934–1939, in particular – in the activity of its performing section. New organizing methods in the preparation and conducting of the artistic events and formation of professional priorities and criteria have been characterized. Among more important aspects of “The Union of the Ukrainian Professional Musicians in Lviv” – organization of the thematic and jubilee concerts aimed at the active introduction of concert life in Lviv with the participation of the most brilliant Lviv composers and performers, organization and conducting of the performing contests, creation of music programs of the Ukrainian music on Lviv radio with the participation of the leading soloists-instrumentalists and chamber ensembles.