Signals Music Studio has come up with an extensive collection of 43 essential music theory concepts, aimed at helping to demystify various musical expressions and terms. He explains:
This is a tour of music theory for the modern composer. I think these concepts are very important to learn, and in this order specifically! This doesn't encapsulate all of music, but it is a very solid foundation. Knowing these topics will enable a songwriter to easily approach new advanced music theory topics with ease.
He's supplied a PDF to download covering all of the topics, and runs a course on 'Music Theory & Songwriting'. More information here: https://signalsmusicstudio.com/product/signals-music-theory-and-songwriting-course/
Gaz Williams explains
From recent Brighton gig
Oh and NAMM too
More Feedback Machine is insane