Every guitarist reaches a point where they want their playing to sound heavier, moodier, more intense. The minor scale already sounds darker than major, but there’s a specific technique that takes it further. Colin Daniel covers two approaches to getting that darker sound: the flatted 5th (one of the most powerful single-note modifications in music) and D minor — which, if Spinal Tap’s Nigel Tufnell is to be believed, is “the saddest of all keys.” Both concepts plug right into the guitar scales you already know.
The Flatted 5th: The Devil’s Note
The starting point is a scale you should already know: the A minor diatonic scale. Colin uses the standard 5th-fret position with one-finger-per-fret technique. Once you’ve got that under your fingers, you can start modifying it.
The flatted 5th sits between the 4th and 5th scale degrees. In the key of A minor, the scale degrees are:
1(A) – 2(B) – b3(C) – 4(D) – b5(Eb) – 5(E) – b6(F) – b7(G)
That b5 — the note between D and E — is historically called the tritone or “the devil’s note.” It creates immediate tension. Metallica built a huge part of their sound around it. Jimi Hendrix used it at the opening of Purple Haze in the key of E.
Colin stresses two important rules about using the flatted 5th:
- You can’t land on it. The b5 is technically a chromatic passing tone — it’s not part of the key. Use it to move through, not to rest on. If you land on it, it sounds wrong. If you pass through it, it sounds dark and intentional.
- Emphasize it, but resolve it. The tension the b5 creates needs to go somewhere. Slide into it, bend through it, use it as a passing note between the 4th and 5th — but always resolve to a note that’s actually in the key.
This works in both single-note runs and rhythm playing. Colin demonstrates playing the root and b5 together as a bass interval — two notes that create an immediately ominous sound. That’s the same interval Hendrix used: the low E string open with the b5 (Bb) above it.
D Minor: The Saddest Key
If you know the A minor diatonic scale shape, you already know D minor — you just need to move it. The D minor diatonic sits at the 10th fret with the same fingering pattern. One finger per fret: 1st finger on the 10th fret, 2nd on the 11th, 3rd on the 12th, pinky on the 13th (with the usual pinky stretch to the 14th fret on the 4th string).
The notes are D-E-F-G-A-Bb-C-D. Colin points out that whether D minor is truly “the saddest key” is debatable — but minor keys in general carry that darker, more melancholic quality compared to major keys. The lower you play on the fretboard, the deeper and heavier the sound. D minor at the 10th fret has a rich, thick tone that suits darker material.
Since the scale is movable, you can apply the same pattern anywhere. Move it down to the 3rd fret for G minor. Up to the 12th fret for E minor. The pattern is identical — only the pitch changes.
Combining Both Techniques
The real power comes from combining these ideas. Take the D minor diatonic at the 10th fret and add the flatted 5th (Ab, which sits between the 4th degree G and the 5th degree A). Now you’ve got one of the darkest-sounding scale combinations available — a minor scale in a “sad” key with the devil’s note added for extra tension.
For players who are still working on the A minor pentatonic box, the flatted 5th is actually what turns a minor pentatonic into a blues scale. Add that one note and you’ve got the six-note blues scale that’s driven countless solos across every genre.
If you want to understand why minor scales sound dark while major scales sound bright, the major vs minor scales breakdown covers the theory behind it. And if you’re working on connecting these patterns across the fretboard, the flatted 5th drops right into any position of the pentatonic climb.