Neighbor Tones

A neighbor tone is a note outside the chord that shows up between two statements of the same chord tone. The melody sits on a chord tone, steps up or down by a second, then returns to exactly the note it started on. Because it leaves and comes straight back, the ear hears it as a brief detour, not a new harmonic destination. That round trip is what makes it decoration rather than structure: the chord tone is still the real note, and the neighbor just dresses it up on the way through.

Direction gives the two types their names. An upper neighbor steps up from the chord tone and back down. A lower neighbor steps down and back up. Nothing else changes between them: same chord tone, same rule of stepwise motion, same return. In a melody singing G, A, G over a C major chord, G is the chord tone, and A, a step above it, is an upper neighbor that resolves back to G without ever belonging to the harmony.

Neighbor tones live right next to passing tones in this unit because both fill in stepwise motion between chord tones, and both get labeled as embellishments rather than harmony notes. The difference is destination: a passing tone connects two different chord tones and keeps moving forward, while a neighbor tone leaves and returns to the same one. Once a neighbor fails to return and instead leaps away to a new note, it stops behaving like a neighbor at all and turns into an incomplete neighbor or escape tone, a sign that this family of figures bends by how it resolves, not just by how it enters.