Musicology Annotation << Back Musical Collections of the August Patrons of the Imperial Russian Musical Society G.A. Moiseev The paper is concerned with musical libraries of the august patrons of the Imperial Russian Musical Society, Grand Duke Constantin Nikolaevich, Grand Duchess Alexandra Iosifovna, Grand Duke Constantin Constantinovich. In the paper some unknown archival materials have been introduced and put into scientific using for the first time. Key words: Russian music of the 19th century, Russian Musical Society, Marble Palace, music libraries, primary sources. E-mail: gmoiseev@yandex.ru