The Passacaglia for orchestra, Opus 1, is the first published composition of twentieth century Austrian composer Anton Webern, who was mentored by who?
Anton Webern:  Along with his mentor Arnold Schoenberg and his colleague Alban Berg, Webern was at the core among those within and more peripheral to the circle of the Second Viennese School, including Ernst Krenek and Theodor W. Adorno.
i don't know