Eduard Stark (also known by the pseudonym Siegfried) was a Russian music critic, musicologist, and art historian who made a significant contribution to the study of musical and theatrical heritage. Born in 1874 in Saint Petersburg, he graduated from Saint Petersburg University. He began his literary and critical activity in 1901, actively collaborating with leading pre-revolutionary Russian periodicals such as the magazines "Theatre and Art", "Theatre Review", and the "Yearbook of the Imperial Theatres". After 1917, Stark continued his successful work in the Soviet press, publishing in the magazines "Life of Art" ("Zhizn iskusstva"), "Soviet Art" ("Sovetskoe iskusstvo"), "Theatre and Music" ("Teatr i muzyka"). He wrote music reviews, critiques of musical-theatrical performances, and critical articles about the work of outstanding composers and performers, including Pyotr Tchaikovsky, Mikhail Glinka, Fyodor Chaliapin, Leonid Sobinov, and Ivan Ershov. Eduard Stark is the author of several fundamental works on the history of opera and ballet. Among his most significant publications are the books "Petersburg Opera and Its Masters. 1890–1910" (1940) and "The Stage History of Pyotr Tchaikovsky's Operas in the Former Mariinsky Theatre" (1941), which remain valuable sources for researchers of theatrical art. The Bakhrushin Theatre Museum's online collection features archival documents, including letters from Eduard Stark and materials for his books.