A fine guess but actually I cycle through what I think is a pretty big range. E.g., several Denes Agay classical+romantic compilations, the standard basic Bach + Beethoven, simple Chopin, John Field, Philip Glass (repetitive patterns help), etc.

Another frustrating thing is it's not just long-term finger memory that kills me, my real-time memory bus is slow when learning a piece -- the transfer of "what notes comes next" down to my fingers, just very slow and error-prone. I've tried a mental exercise where I try to only think about what to play "next" and just let what I'm playing "now" take care of itself. It kind of works and feels very different. Basically, to stay 2 beats ahead of the music at all times.

Ugh, but it's still a struggle. My finger dexterity is fine. My musical knowledge is actually pretty advanced and I can play expressively and convincingly -- but only when I can remember the damn piece. My memory is like a balloon that won't stay inflated.

https://www.amazon.com/Classics-Moderns-Intermediate-Grade-M...