Article / Updated 03-26-2016
Phrygian is the third mode of the major scale on the guitar — when the 3rd scale degree functions as the tonic. It’s considered a minor key because it centers on a minor chord.
This type of minor scale is pretty uncommon, but some heavy metal artists use it for its dark, unusual sound. Here’s what happens to the G major scale when you reorganize its notes and chords, beginning with the 3rd degree, B, to produce B Phrygian mode:
G major
1-2-3-4-5-6-7
G-A-B-C-D-E-Fs
I-ii-iii-IV-V-vi-viif5
G-Am-Bm-C-D-Em-Fsmf5
B Phrygian
1-f2-f3-4-5-f6-f7
B-C-D-E-Fs-G-A
i-fII-fIII-iv-vf5-fVI-fvii
Bm-C-D-Em-Fsmf5-G-Am
Phrygian is a type of minor scale with a flattened 2nd as its most defining characteristic.