Sir's Guitar Classes on Instagram: "In our 12-note music system, every chord is built using formulas. To turn a Major chord → Minor chord, you only change ONE note! 🔸 Major Chord Formula: 1 (Root) – 3 (Major Third) – 5 (Perfect Fifth) 🔸 Minor Chord Formula: 1 (Root) – ♭3 (Minor Third) – 5 (Perfect Fifth) 👉 Just lower the 3rd by one semitone That’s it! C Major (C–E–G) → C Minor (C–E♭–G) G Major → G Minor D Major → D Minor Works for every key! Perfect concept for beginners to understand chord m