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If music theory ever felt confusing, this is your reset button. 90-Minute Music Theory Crash Course is a clear, step-by-step guide that strips out the fluff and shows you exactly what matters—intervals, chords, keys, scales, and how they connect. Designed with guitarists in mind but friendly for total beginners, you’ll learn by doing: quick drills, simple diagrams, and tiny wins that stack fast. No dense jargon. No rabbit holes. Just the essentials, taught in the right order, so you can finally hear what you’re playing—and why it works. Walk away in one sitting with a real grasp of the foundations, the confidence to build progressions and melodies, and a roadmap for your next practice session. Transform your understanding fast—step by step. This book does not cover everything in music. No seventh chords, chord extensions, or mode talk.  Consider the 90 minute Music theory Crash Course to be milestone one.  Those concepts will come up in book two.