Year 1904. 24-10-1904. With Willem Mengelberg (1871-1951) and Alphons Diepenbrock (1862-1921). Train Haarlem – Zandvoort (Electric). If you have found any errors or text needing citation, please notify us by selecting that text and pressing Ctrl+Enter. Related posts: Willem Mengelberg (1871-1951) Alphons Diepenbrock (1862-1921) Gustav Mahler’s Legacy Mahler Festival 1920 Amsterdam Hendrik (Han Henri) de Booy (1867-1964) Gustav Mahler himself in The Netherlands (1903, 1904, 1906, 1909 and 1910)