 Although Stockhausen and Piene 's planned multimedia project , titled Hinab @-@ Hinauf , was developed in detail ( Stockhausen Texte , 3 : 155 – 74 ) , the World Fair committee rejected their concept as too extravagant and instead asked Stockhausen to present daily five @-@ hour programs of his music ( Kurtz 1992 , 178 ) . Stockhausen 's works were performed for 5 ½ hours every day over a period of 183 days to a total audience of about a million listeners ( Wörner 1973 , 256 ) . According to Stockhausen 's biographer , Michael Kurtz , " Many visitors felt the spherical auditorium to be an oasis of calm amidst the general hubbub , and after a while it became one of the main attractions of Expo 1970 " ( Kurtz 1992 , 179 ) . 
