I'm trying to teach my son theory and every theory book I see seems to be littered with stuff about parallel 4ths and other things which are useless for popular music. I'm on the verge of writing my own book. In my mind the 3 important things for him to learn are: Knowing the major scale and what it's interval relationship is (i.e. what's a major 2nd, major 3rd, perfect 4th, perfect 5th, major 6th, major7). Anything that's not a major scale can be analyzed as differing from the major scale. i.e. dorian is 1,2,b3,4,5,6,b7 Memorizing the key signatures i.e. what sharps are in the key of C#?, how many flats in Cb? Being able to stack 3rds and analyze 7th chord structures for any scale,i.e. for a Major Scale, Imaj7, IImin7, IIImin7,IVMaj7,V7,VImin7,VIImin7b5 If there is nothing out there with this approach I may write my own book. I can't imagine it'd take more than 20-30 pages. However, I have to believe it already exists.