My only child (Dr blam) was conceived in Golden Gate park at a free Grateful Dead concert then.
Here's another song from 1967. The guy doing the vocals is only 16 years old.
The Letter
(The Boxtops)
Saw a program about the Zodiac serial killer in which the interviewed a retired SFPD detective.
He said “In 1967, you were supposed to come to San Francisco with flowers in your hair, but by 1969 you would have been wise to also be carrying a revolver.”