Progressions in Bb — 4-Voice Polysynth

Bb major harmonizes to Bb – Cm – Dm – Eb – F – Gm – A°; Bb minor to Bbm – C° – Db – Ebm – Fm – Gb – Ab. 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.