How were music posters made in the 1970s?

In the 1970s, music posters were typically created using screen printing techniques, which allowed for bold colors and intricate designs. Artists would often hand-draw images or use photographs, which were then transferred onto screens for printing. Many posters featured psychedelic art styles and were produced in limited runs, making them collectible items. Additionally, the rise of rock and counterculture movements influenced the creative direction and themes of these posters.