Japanese-Style Advanced Harmony Techniques (jp-harmony-advanced)

This skill is compiled from "初歩から身につく！コードの選び方マニュアル" (Sho Ueda), Chapters 3–4, and "もっと！思いどおりに作曲ができる本", Chapter 2. All examples default to Key=C (minor examples default to C Minor / A Minor unless otherwise noted). All progressions are notated both in letter names and Roman-numeral degrees. Large reference tables (full secondary-dominant table, full tension table, full passing-diminished table, etc.) are in reference.md in this directory.

Prerequisites at a Glance (30 seconds)

• Functions: T (トニック, tonic), S/SD (サブドミナント, subdominant), D (ドミナント, dominant). The minimal cadential unit is the カデンツ (cadence).
• Substitution principle: chords sharing most of their tones can stand in for each other. T = I / IIIm7 / VIm7; S = IV / IIm7; D = V7 / VIIm7(♭5) / IIIm7.
• 強進行 (kyō-shinkō, "strong progression") = root motion up a perfect 4th (= one step counterclockwise on the circle of fifths), the root motion with the strongest forward drive; half of the techniques in this skill are built on it.
• トライトーン (tritone): the augmented 4th formed by the 3rd and 7th of a dominant seventh chord — the source of tension and the urge to resolve (the theoretical basis of the ura-code / 裏コード, tritone substitution).

Symptom → Technique Quick Lookup