In my initial notes on all of the albums, I didn't have much (or even anything) to say about To Our Children's Children's Children or Every Good Boy Deserves Favour, so I've been listening to those fairly regularly since I started this project (and I have some notes I need to get around to fleshing out into posts here).
To-day I figured out the guitar and flute parts for one section of "Procession" (~3:26 to ~3:37), and I'm working on the harpsichord part that follows it. In playing that section over and over again in order to figure out the notes, I noticed the organ trill that immediately follows it. It's a trill between A and G, which is the same trill that starts Bach's Toccata and Fugue in D minor, BWV 565. Since "Procession" apparently traces the development of music, I think this is an intentional reference. The organ there sounds more like a Hammond than a pipe organ though, so it's not historically accurate, but whatever.