Terzschritt

[1] Additionally, and more specifically, it is a dualistic major third relationship, in which the ascending progression from a major tonic triad to major mediant triad is equivalent to the descending one between a major tonic triad and a flat subdominant minor triad.

In the work of Hugo Riemann (1849-1919), inversionally related chord progressions are grouped together: the progressions C major→E major and C minor→A♭ minor belong to the same category: "Terzschritte" (see counter parallel).

"[2] In the context of neo-Riemannian theory, this transformation is called "L-then-P".

The basic transformations of neo-Riemannian theory, discussed below, all associate changes in direction with the switch from major to minor.

Tonic Supertonic Sp Mediant Dp, Tkp, tP, [D](Sp) Subdominant Dominant Submediant Tp, sP, tCp Leading tone D̸7 Subtonic dP