Voice Leading Basics

Voice leading is the art of connecting chords one note at a time rather than jumping all the voices together — think of a four-part chorale as four separate singers, each trying to move as little as possible from one chord to the next. Smooth voice leading is what makes a progression sound connected instead of like a sequence of unrelated blocks.

Two guidelines carry most of the weight: keep common tones (a note shared between two chords) in the same voice rather than re-attacking it, and move the remaining voices by the smallest available step or leap, preferring stepwise motion and contrary motion (voices moving in opposite directions) over several voices leaping the same way at once.

Traditional voice leading specifically avoids parallel fifths and parallel octaves — two voices moving in the same direction by the same interval, locked a fifth or octave apart the whole way. It's not that they sound "wrong"; they sound too fused, collapsing the independence between voices that gives part-writing its richness. (Genres built on power chords use exactly this effect on purpose — context decides whether a rule is a rule.)

The leading tone gets special treatment: in a V-I progression it almost always resolves up by step to the tonic, because that pull is precisely what makes the cadence feel resolved. Leaving it hanging or leaping away from it undercuts the very effect the dominant chord was built to create.