Plain and simple, I have a terrible memory. Unsurprisingly, my body of memorized scores is slim. At 70, I don’t think that’s going to change. On the one hand this has made me a good sight-reader, but I long to play unattached to a score.
Many years ago I started practicing scales and what I called “my finger exercises.” Musical harmony is not made of great tonal leaps, but subtle tonal changes with feeling. Over the years I’ve learned to just follow my fingers. Early in the morning is the ideal finger exercise time.
Here is a raw sample from 2011 recorded on a Yamaha KX-88 midi controller: