This is the title track of my latest bandcamp album. At one time back in the 1970s I could play the whole of the organ part, and the walking bass live. Can't do that now, Fingers too stiff and way out of practice
On the brighter side I can still just about manage the main part in one sitting. In some places I hold down an octave span with thumb and little finger, using the others to create chord inversions and/or short melody runs.
The whole album is:
https://willgodfrey.bandcamp.com/album/RetroP.S. All done with the Yoshimi synth - including drums