I recently finished Book II and thought I'd post some of my exercise doodlings. Be aware, these are all just short exercise phrases that I wrote as part of the course (so over the last six months or so, I've written probably 200 or so of these phrases).
EIS has been a brilliant experience so far. A well-structured and practice-focused dive into what makes sound sound good. I know interest in EIS around here waxes and wanes (as does the forum opinion of it). What I really love about the course is how it has forced me to confront the fact that writing good music is about hard work and practice, just the same as playing an instrument. The course is better compared with going through weight lifting training, or learning an instrument, than in "magically unlocking" some next-gen theory that will instantly make you John Williams or Hans or something.
That having been said, Spud was clearly a savant when it came to sound and its application to making music, and he absolutely offers a unique way of thinking about harmony and music that allows for very effective organisation of all the available harmonic resources. He's just not interested in giving you the 5-lecture version that will be nothing more than an idle curiosity.
To put this in context, this morning I played the melody from a kids' action TV show I loved, made back in the 60s/70s (so, before my time!). I have never been able to figure out the harmony of this piece properly (I like to work intuitively, from memory, rather than transcribe as listening). Today, I instantly played the piece on the piano, with full and (certainly to my musical memory/feel of it) correct harmony. I couldn't believe my hands! The things I've learnt just in Book II of EIS absolutely made my natural understanding/instinctive inner ear kick in in a way that it could have not done before. That's not just EIS being a good 'theory', it's EIS being excellent musicianship training.
So thank you awfully to Spud for creating the course and apprenticing as many students as he did. And thank you to his musical descendents who continue to pass on this most excellent and wonderfully idiosyncratic music education.