Scott Jarrett, Holly Day. Music Composition For Dummies - A light overview on motives/phrases, the role of harmony and orchestration, ideal to understand something without graduating from college first. Although the book of Belkin (see below) is also approachable (the book of Schoenberg analyzing Beethoven’s sonatas is less so). The companion prerequisite book on music theory for dummies also exists.



Peter Edwards. Write Like Mozart: An Introduction to Classical Music Composition - A six-week Coursera course that starts with four-part writing rules and goes into textures, chord substitutions, 2:1 counterpoint with examples from Mozart and Beethoven.
Building Blocks - A music theory and composition course in an online DAW from the creators of Syntorial
Art of Composing - An email course. It’s also repackaged as Workbook 101 and Workbook 201. Also https://youtube.com/@artofcomposing
Edward Sarath, Music Theory though Improvisation - as a modern books like Russo’s
Jorge Variego. Composing with Constraints: 100 Practical Exercises in Music Composition
https://www.amazon.com/1001-Music-Composition-Prompts-Creativity-ebook/dp/B0BQJNG86C/
https://www.staffpad.net/
https://www.reddit.com/r/musictheory/wiki/compchallenge/
Margaret Lucy Wilkins. Creative Music Composition: The Young Composer’s Voice
Also mention GCSE and A-level books: alan charlton, russell/harris, martin hinckley
There are autobiographies:
Then there are composers’ reflections. Some are targetting laymen, eg:
Some are targetting musicians and can be either coursebooks (Rimsky-Korsakov, Schoenberg) or descriptions of one’s compositional approach (Messiaen)
And then there are sketchbooks:
