Scales
Metal Guitar Scales
Metal guitar scales are chosen for their darkness and tension. The minor pentatonic is the foundation, shared with blues and rock. Natural minor extends that vocabulary. Phrygian adds the flat 2nd that creates a sinister, Spanish-influenced darkness. Harmonic minor brings the raised 7th that drives the dramatic V7-i cadences found in classical-influenced metal. Each scale serves a specific emotional purpose.
Minor pentatonic: the starting point
Every metal guitarist starts with the minor pentatonic. It is the same foundation used in blues and rock, which is not a coincidence: early metal came directly from those traditions. Tony Iommi, Angus Young, and the early Metallica rhythm vocabulary all draw from the minor pentatonic as the bedrock.
In E, the first box position sits at open position. This is the most common starting point for metal because E is the lowest standard tuning note, which gives riffs the maximum physical weight in the low register.
E minor pentatonic — open position
Explore in Scale Mapper →The open strings (to the left of the nut) are part of the scale. E, A, D, G, and B open strings all belong to E minor pentatonic. This is why open-position E minor riffs are so physically natural on guitar and why so many metal riffs are built around them.
Natural minor for full melodic range
Natural minor adds the 2nd and 6th degrees to the pentatonic, giving you seven notes instead of five. In E natural minor, the additions are F# (2nd) and C (6th). These extra notes allow longer melodic runs, sequences, and more specific targeting of chord tones in diatonic riff writing.
Fast scalar runs in metal are almost always natural minor or harmonic minor. The pentatonic leaves too many gaps for rapid linear passages. Natural minor fills in those gaps while staying dark. Scale sequences (patterns of 3 or 4 notes repeated up the scale) on natural minor are the foundation of most lead guitar runs in thrash and classic heavy metal.
E natural minor — open position
Explore in Scale Mapper →Compare this with the E minor pentatonic above. The F# (fret 2 on the low E and high e strings) and C (fret 3 on the A string, fret 1 on the B string) are the two additions. Those extra notes are what turn five-note phrases into full seven-note runs.
Phrygian for maximum darkness
Phrygian mode is natural minor with a flat 2nd. In E Phrygian, the 2nd degree is F natural instead of F#. That one semitone change is dramatic. F natural is only one semitone above E, creating a half-step clash with the root that produces the characteristic sinister tension of Spanish guitar and metal.
The bII chord (an F major chord over an E tonal center) is one of the most common metal chord moves. The riff from Iron Man, the chord movement in many Metallica and Megadeth songs, and the Spanish-influenced phrasing of Marty Friedman all use this bII-to-root movement. Iommi established it before most metal guitarists knew it was a mode.
E Phrygian — flat 2nd (F) highlighted
Explore in Scale Mapper →The amber F circles show the flat 2nd. On the low E and high e strings, F appears at fret 1, just one fret above the open E. That proximity to the root is what makes Phrygian sound so tense and unstable. The ear cannot settle on E as a resolution when F is one semitone away.
Harmonic minor for classical drama
Harmonic minor raises the 7th degree of natural minor by one semitone. In E harmonic minor, the 7th becomes D# instead of D natural. That raised 7th creates a strong pull toward the root and enables the V7 chord (B7 in E minor) with a major 3rd, which natural minor does not have.
Randy Rhoads used harmonic minor arpeggios and scale runs as the foundation of his classical-influenced metal solos. Kirk Hammett uses it in solos that need dramatic tension. The scale produces an augmented 2nd interval (three semitones) between the 6th and 7th degrees, which is the distinctive sound of Middle Eastern and Eastern European music that metal absorbed into its vocabulary.
E harmonic minor — raised 7th (D#) highlighted (7th position)
Explore in Scale Mapper →The amber D# at fret 11 on the low E and high e strings is the raised 7th. In natural minor it would be D at fret 10. That half-step difference is the entire character of harmonic minor.
Downtuning and scale choice
Most metal is played in Eb standard, D standard, drop D, or lower. Downtuning does not change the scale shapes or intervals. The fingering patterns remain identical. The only difference is the pitch: the same shape played in standard E tuning becomes Eb, D, or C# depending on how far down you tune.
Drop D tuning (low E dropped to D) is a special case. It gives you a power chord on the bottom three strings with a single finger, but it also shifts the note layout on the low string only. The top five strings remain standard. This means all scale shapes on the top five strings stay the same, but notes on the low string shift up two frets to compensate for the tuning change.
For a breakdown of how drop D affects chord shapes see what are power chords.
Explore metal scales on the fretboard
Load E Phrygian and compare it with E natural minor. The flat 2nd (F) is the single note that changes everything.