Why Wynton Kelly’s Autumn Leaves Voicings Sound So Big

Wynton Kelly's big voicings sound so rich because they strategically use guide tones (3rd and flat 7th) in the left hand, add tensions like flat 13, and harmonize melody notes with octave-and-fifth structures that create partial reinforcement, making chords sound bigger; the key principle is that doubling notes which share partials creates reinforcement, while doubling avoid notes (like major 7th and 11th over dominant chords) creates dissonance, and minor 7th chords naturally sound consonant because their partials reinforce the chord tones.