Calculating Parent Major Scales

View the full lesson at Calculating Parent Major Scales | JustinGuitar

Another way, along with Justin’s excellent “memorise the position” method, in helping me learn how to quickly find the PMS of the Mode I’m playing in is this:

MODE - NOTE NUMBER OF MODE THAT IS THE PMS

IONIAN - 1st (or 8th/Octave if it’s easier to remember that way)
DORIAN - 7th
PHRYGIAN - 6th
LYDIAN - 5th
MIXOLYDIAN - 4th
AEOLIAN - 3rd
LOCRIAN - 2nd

A logical descending sequence. I’ve written these numbers in on Justin’s “All of the above” diagram, it’s just another way to help remember/work out the PMS quickly.