This poster is one of the four different styles produced to promote the "Monster Concert" which took place over two days in Zurich - this style was printed in at least three different colours - orange, blue and beige. It was one of the first big rock events in Europe, certainly the first in Switzerland, preceded only by the Rolling Stones who played the Hallenstadion in April, 1967. Although Cream are listed on the posters, they did not appear as they were touring the U.S. at that time.