Voice may also have a bitonality or diplophonia, with the perception of two different fundamental frequencies (or pitches) simultaneously.

Despite the frequent use of parallel harmonies, often moving chromatically, expanded sonorities (seventh and ninth chords), persistent pedals and drones and short passages of bitonality, created by the frequent discrepancy between the tropos of the folk melody and the accompaniment, the cadences of each movement clearly are linked to the underlying tropos.

From Greene's collection, "Waltz for a Distracted Sole" features bitonality and surprising meter changes within a traditional waltz context.