Monterey Pop oozes 1960s freedom and optimism, and is based on Tom Wilkes’s poster lettering for the Monterey International Pop Festival in June 1967, the event which heralded the legendary Summer of Love.
The fonts include a newly-designed lowercase and a full complement of Latin Extended-A characters. In addition to the normal font, Outline and Thinline versions with matching spacing and kerning are supplied for use separately or overlapped with the regular font for bicolor effects. The Outline font is best for darker lines, and the Thinline font is designed for white and tinted outlines which can tend to halo and appear slightly bolder.
You can read more about the inspiration for these fonts in the Kernel.