The article focuses on the musical life of Leningrad and Moscow in the second half of the 1920s. During this time the Soviet Russia re-established connections with the West that had been disrupted in the years after the beginning of the First World War. Concerts of contemporary music were arranged, including modern music by European composers. Many of them came to the USSR to perform their works. This article presents new documents from the Austrian National Library and Vienna Library in the City Hall (Wienbibliothek im Rathaus). These documents are related to the first stagings of operas by Austrian composers Franz Schreker (“Der ferne Klang”), Alban Berg (“Wozzek”) and Ernst Krenek (“Der Sprung über den Schatten”, “Jonny spielt au...