The hype in that description is staggering...  Artwork records is the label. https://kennybarron.com/recordings/songbook/

Yes it is.  All of his other Muse CD's are much more conservative (overly so IMO).

That's a great album

We never got those in the UK as far as I know, certainly not in my lifetime. I well remember "flexi discs" (as described by Big Beat Steve above) which were sometimes given away in music magazines, or for promotional material. A few years ago I came across a handful of these in a box of records I bought - they were 7 inchers, and contained promotional material aimed at Doctors, for medications for diabetes and depression as I recall. I also remember one for Pontins Holiday Camps (I'm sure the older Brits will recall those) which was a ditty titled "Thumbs Up, Book Early!"