You know the theory. You just have to look it up. Scale Theory is a drill tool for musicians who want faster, more reliable recall — key signatures, diatonic harmony, modes, chord functions, and relative minor relationships. Not slower. Not effortful. Just known. What you'll learn: • Key signatures: sharps, flats, and which notes they are, in both directions • Relative minor keys, quizzed both ways • Diatonic triads and seventh chords in every major key — names, qualities, and notes • All seven modes: names, interval formulas, and characteristic chords • Chord functions: identify and spell the dominant seventh and half-diminished chord in any key How it works: Each topic follows a review-then-quiz loop. New items are revealed one piece at a time, so you're predicting the next step before it appears. After every few new items, a recap quiz covers everything learned so far — not just what's recent. A randomized Practice mode presents questions in mixed formats across all keys, with upcoming answers hidden so you can't read ahead. Key signatures follow circle-of-fifths order, which is how keys actually relate to each other. Who it's for: • Players who want to think faster when improvising or reading charts. • Anyone whose theory knowledge lives in their head in a slow, effortful way. • Students prepping for graded exams. This is a drill tool, not a lesson. It assumes you've encountered these concepts — it's here to make them automatic.