D Harmonic Minor, Mapped for the Guitar
Where D Harmonic Minor lies on this seat's fretboard, and how a blues phrase leans on it.
D Harmonic Minor runs 7 notes to the octave, laid across this seat's EADGBE fretboard with every D marked. A blues phrase is short and keeps coming home to one pitch; the marked notes are where it comes home to.
Dark and dramatic. The raised 7th pulls hard toward the tonic, and the wide step from the b6 up to it gives the scale an exotic, almost Middle-Eastern tension.
Heard in: Classical minor-key harmony, neoclassical metal (Yngwie Malmsteen), flamenco-tinged rock, klezmer, and Balkan melodies.
On the guitar a scale is mostly raw material for bends: a note a fret or two below the one you want, pushed up until it sounds right against the chord, which is how a fretted instrument reaches the pitches between its frets.
Whatever scale you start from, the blues bends it: the third and the seventh get pushed flat, or somewhere between flat and natural, and that pull against the chord underneath is most of what the idiom sounds like.