Throughout this book we’ll be discussing many things you may have heard of before, but never really understood. We’ll be shedding light on key signatures, scales, intervals, inversions, the Roman numeral system, diatonic harmony, chord structure, progressions, voicings, alterations, extensions, and more. We’ll start out with the basics and gradually proceed to a more advanced level. Sure, it’s a lot to absorb. But it should be no more difficult than when you had to master the double-stroke roll or develop your hand and foot coordination.