I have a hunch that everything I need to learn can be learned by studying the Lemon Song. I am, so far, completely self-taught with a very limited musical vocabulary, so forgive me. I have a few questions and theories about the Lemon Song and I would like to hear your input. After a few years of exploring many forms of bass playing, it dawned on me that I should probably focus on John Paul Jones' Zeppelin work for a while. After all, I'm a drummer who has pretty much every Zeppelin song absolutely imprinted in my heart, and I can't tell you how valuable that toolbox is. First, is the Lemon Song "twelve-bar blues?" If it is, I finally get it. Second, I get that the chord progression is E, A, B, E, essentially. Are any of these flat? How does one tell? What would I do with that knowledge? I see the very basic principles at work in this very standard song, but I know there's some underlying and unifying theory I am missing. I can see how JPJ treats the root, I can see how he applies what I think are called "chromatic approaches." I can mimic the way he gets around within each chord, and how he gets from chord to chord, but I don't yet understand why he does what he does and how I would apply that to other progressions. So what is he doing and what else can I learn from the Lemon Song? For my own purposes, I have built a Lemon Song framework in Garageband that I can noodle with. What would you guys focus on when practicing along? Hope this makes sense. Thanks.