Intermezzo for flute and harp by Hendrik Andriessen was played by Raymond Delnoye (flute) and Teresia Rieu (harp) on October 5, 1974 at Ypenhof. Approximately from 1970 to 1975 music evenings were organized on Ypenhof Rotterdam by Chris van Baarle and Michiel Goudriaan. Some records were found and edited.