I stumbled upon this footage when I was spending some idle time at the Internet Archive. The footage had no sound, and according to the description it was found when an office building was being cleaned out and the film emulsion was starting to decompose.

The vivid colors and the nostalgia for the 1960s got the creative juices flowing, and I started hearing a soundtrack in my mind’s ear that I wanted to add to this footage.

The original Archive.org page is here.