During World War I he was the head of the Dutch Royal Opera ( 1916 -- 18 ) .
During World War I he held summer concerts of the Orchestra in Residence of the Hague in Scheveningen ( 1914 -- 19 ) .
During World War I he was the head of the Dutch Royal Opera ( 1916 -- 18 ) and held summer concerts of the Orchestra in Residence of the Hague in Scheveningen ( 1914 -- 19 ) .