(all. Ausfaltung ; angl. Unfolding)
Unfolding is an elaboration in which several voices of a chord or a chord succession are combined to form a single line “in such a manner that a tone of the upper voice is connected to a tone of the inner voice and then moves back to the upper voice, or the reverse” (Free Composition, § 140, p. 50).
At the end of Schubert’s Wanderers Nachtlied op. 4 n. 3, the sung voice unfolds two voices belonging to the progression I–V–I; the lower of these voices, B♭–A♭–G♭, is the main (the leading) voice: