parent scales for the major II-V-I progression

Horizontal¹ approach — Lydian Scale throughout

ChordLydian parentMode
IImi7IV LydianII Dorian
V7IV LydianV Mixolydian
Ima7IV LydianI Ionian
Transposable model (degrees in Roman numerals)

ChordLydian parentMode
Bmi7D LydianB Dorian
E7D LydianE Mixolydian
Ima7D LydianA Ionian
Example in the key of A major

Notes

¹ for a vertical sounding resolution on the Ima7 chord, use the Lydian mode on the tonic instead of Ionian.


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