In looking at the list you provide, I don't believe these two ever existed:
I just updated my page to reflect your thoughts. Is there any historical record at AMG as to why Amazon lists these books? Somehow they got as far as receiving official ISBN numbers and designs of possible covers, but never made it to publication?
Also, why does allmusic.com not mention any of these books on their web site?
"These do not exist. I vaguely remember talking about this" ... "we both always loved the idea of an almanac--but I had no idea that it even reached the provisional stage and I certainly didn't think there was art for it."
"these were proposed after [the head of the editorial department] told Backbeat we'd never do another General Guide again."In regards to why we don't talk about the books on AllMusic.com, the books are no longer in print and we do not have a way to sell copies of any that may still remain. The site focuses more on making the music information available and less on the historical aspects of AMG as a company.
There's a pretty good article about the twists and turns that we have taken over the past 25 years available here: http://tedium.co/2016/09/20/allmusic-database-historic-importance/