The P Transform
P on C, voice by voice: the chords it pairs, the voice that steps, the source's own words, and every chord each side spells.
On C, P (Parallel) pairs C (C E G) with Cm (C Eb G): 1 voice steps, 2 hold, and the lead costs 1 semitone.
| Voice | Becomes | Step |
|---|---|---|
| C | C | holds |
| E | Eb | -1 |
| G | G | holds |
What each side spells
- C: C
- Cm: Cm
As the source prints it
Parallel relates a major triad and the minor triad sharing the same root, such as C and Cmi.
The Parallel transformation (P) preserves the perfect fifth in the triad and moves the remaining note by semitone.Its example:
C and Cmi.
— Open Music Theory, 2nd edition, 5.14 Neo-Riemannian Triadic Progressions; Mark Gotham, Kyle Gullings, Chelsey Hamm, Bryn Hughes, Brian Jarvis, Megan Lavengood and John Peterson. The source, read 2026-10-25.
Rank every pairing of C and Cm in the calculator · Every chord one voice from C