June 1967 marked the beginning of the “Summer of Love” in San Francisco. The city’s zeitgeist was defined by its psychedelic art and music, and the Monterrey Pop Festival embodied that. Legendary performances by Jimi Hendrix, Janis Joplin and The Who established them in the pantheon of rock stardom. Artist Bonnie MacLean’s poster for The Who’s Monterrey Pop appearance captured the city’s colorful spirit and created buzz for the British group’s gig at the Fillmore, a stop on their first trip to the West Coast of the United States.