Harmony for Engineers. A simplified approach to the concepts and structures governing Diatonic Harmony. Vsn 1.1 now published with an extra chapter on Minor Scales structures and Harmony.
Special introductory price. Any purchaser receives a life-long free update to future versions and revisions. Head on over to the ToKshop
Yes, eBook #3 (Mixing Techniques) is still ongoing… as is the discipline of Mixing. But in the meantime :)