They were documented by Robin Dunitz.
The Instagram post has 20 photos by Dunitz.
Robin Dunitz Slides of Los Angeles Murals, 1925-2002
Mural Conservancy of Los Angeles database
10 Monumental Murals of Los Angeles
Sunset Strip billboards 1974-75
There is a book of Rock’N’Roll Billboards of the Sunset Strip:
There was an exhibit that accompanied the book. The website has photos:
Another exhibit – see the link and videos above
The Sunset Strip’s Historic Rock ‘n’ Roll Billboards
Sunset Strip billboards through the lens of legendary photographer Henry Diltz, 1968-1980.
from a Bluesky post – don’t know who the artist is:

Sub-versive DC Protester Becomes Memeorable
There’s a shirt now:
Resist DC Sandwich Thrower shirt
Here’s the story – the artist’s website
I tried to order a copy of the painting used on the cover. Sadly, it is no longer available.
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Abbey Road by the Beatles just turned 55. Here are a video and tweets on the front and back cover design.
I just got a signed Robert Crumb print of Gus Cannon.
Cannon led Cannon’s Jug Stompers who recorded the original version of songs in the 1920s that were popular decades later such as “Walk Right In”, “Big Railroad Blues”, and “Viola Lee Blues”

Cannon also made an album in the 1960s.