I'm reading that now! Sadly, after the first section where he derives the diatonic scale, I'm getting a bit lost. He stresses how important it is to play along

I'm reading that now! Sadly, after the first section where he derives the diatonic scale, I'm getting a bit lost. He stresses how important it is to play along with a musical instrument while reading, but I've been insistent on just reading in bed (which is how I do all my reading). But that first section is great.