Progressions in D — 4-Voice Polysynth

D major harmonizes to D – Em – F#m – G – A – Bm – C#°; D minor to Dm – E° – F – Gm – Am – Bb – C. Each chord links to its 4-Voice Polysynth voicings, and the page walks the changes with voiceLeadNearest — the engine that picks whichever next voicing moves the fewest keys.

Voice leading is a keyboard player’s home advantage: common tones stay under the same fingers, and only the moving lines move.