In music, a linear progression (Auskomponierungszug or Zug, abbreviated: Zg.) is a passing note elaboration involving stepwise melodic motion in one direction between two harmonic tones. "The compositional unfolding of a specific interval, one of the intervals of the chord of nature." For example: -- over the tonic. According to Schenker: "A linear progression always presupposes a passing note; there can be no linear progression without a passing note, no passing note without a linear progression." In German Zug may be combined with prefixes to create related words such as Untergreifzug, a linear progression rising from a lower voice, Uebergreifzug ("reaching over"), a linear progression overlapping another, or Terzzug, linear progression through a third. The term Zug may best be translate