This is the title track of my... err... new album (EP) "Retro".
https://willgodfrey.bandcamp.com/track/retro-rock
The original composition of some of these go right back to the 1970s but the earliest actual recordings weren't made until the middle 1990s. One was composed as late as 2018. All have been revised and now use Yoshimi and Rosegarden exclusively.
Back in the day I used to play the organ part of Retro Rock along with the walking bass live. I can still (just about) manage to right hand part but not with the left hand as well. There are places where I hold an octave span with thumb and little finger while using the other fingers for chord inversions mixed with short melody lines.