The diaries of N.F. Findeisen 1902-1909 give a chronology of creative activity for the second decade of his musical literary and editorial work. Contain information about the main activities of N.F. Findeisen at the beginning of the 20th century as an editor, publisher, music critic and their implementation; about the history of the creation and work of musical societies and museums, about his creative contacts with the most outstanding musicians of the era.