Suno AI Prompt Mode Locrian: 10 Tested Templates — The Most Dissonant Mode in Western Music

What Is Locrian Mode — and How to Generate It on Suno AI

H-W-W-H-W-W-W · flat 2nd and flat 5th · diminished tonic · extreme metal, horror, avant-garde

Locrian mode is Mode VII of the seven diatonic modes — built on the seventh degree of any major scale. In B Locrian (built from C major starting on B): B C D E F G A. Compare to B natural minor: B C# D E F# G A. Two critical differences: C natural vs C# (flat 2nd, shared with Phrygian), AND F natural vs F# (flat 5th, unique to Locrian). The flat 5th creates a diminished 5th (tritone) between the tonic (B) and the 5th degree (F) — and this interval is what makes Locrian so fundamentally unstable. The tonic chord in Locrian is a diminished triad (B-D-F), which has no natural resolution point. Unlike every other mode, Locrian's home chord is dissonant — there is no stable resting place, no harmonic resolution. The mode is perpetually in tension with itself.

This perpetual instability is why Locrian is rarely used in traditional harmony — you cannot build a stable home key on a diminished chord. But it is exactly why extreme metal producers, horror composers, and avant-garde jazz musicians value it. For Suno AI, the prompt formula is: Locrian mode [key], [genre], [instrument], [BPM] BPM, flat 2nd AND flat 5th, diminished tonic, [emotional quality — dissonance/unstable/dark/horrifying], no vocals. The two critical tokens are 'flat 2nd AND flat 5th' — this is the only combination that specifies Locrian vs Phrygian (flat 2nd only). Suno frequently produces Phrygian when you specify Locrian without these explicit interval instructions.

Famous Locrian applications: John Coltrane used Locrian-influenced passages in his late period avant-garde jazz. Steve Vai and other neoclassical guitarists use Locrian for its extreme harmonic tension. In metal, Locrian riffs (built on the tritone between root and flat 5th) are common in technical death metal and black metal. In film scoring, Locrian passages are used for horror and extreme tension sequences. Suno's training data contains enough of these contexts that explicit Locrian mode prompts produce genuinely dissonant, tense output — but the disambiguation instructions are non-negotiable.

Locrian is the rarest mode in popular music because its diminished tonic creates harmonic instability most composers actively avoid. Tool's The Grudge (2001) from Lateralus is the most cited example of Locrian in progressive metal — Maynard James Keenan and Adam Jones used its unresolved tension deliberately. Rush's YYZ (1981) and Slayer's heaviest compositions use Locrian-adjacent structures. In classical music, it appears most often as a passing mode — Debussy used diminished structures that approximate Locrian's character in his impressionist works. For Suno AI, Locrian requires the most explicit prompt engineering of any mode precisely because the model has seen it least in training data.

10 Suno AI Prompts for Locrian Mode — Copy, Paste, Generate

Extreme metal · horror · avant-garde jazz · dark ambient · experimental — all instrumental

These 10 prompts cover Locrian's primary applications. Each specifies both the flat 2nd and flat 5th — the essential Locrian disambiguation. Genre context and BPM are precisely specified. Note that Locrian is used for fewer genres than other modes, hence 10 prompts rather than 12.

🎵 Copy-ready Locrian mode prompt for Suno AI

Locrian in Context — Where Dissonance Serves a Purpose

When to use Locrian vs Phrygian vs natural minor on Suno AI

The practical decision between Locrian, Phrygian, and natural minor is a question of how much harmonic instability your project needs. Natural minor gives you stable melancholy — emotionally dark but harmonically solid. Phrygian gives you intense, urgent darkness — the flat 2nd creates tension, but the 5th remains natural, giving the mode a foundation to return to. Locrian removes that foundation entirely — the flat 5th undermines the tonic chord itself, creating music that is perpetually unstable.

For extreme metal: Locrian when you want harmonic collapse (the riff that seems to disintegrate); Phrygian when you want aggressive darkness with a foundation (the riff that drives forward powerfully). For horror film scoring: Locrian for scenes of supernatural horror where normal physical laws seem suspended; Phrygian for scenes of immediate human danger or urgency. For jazz: Locrian for the furthest 'outside' playing, the most abstract dissonance; Dorian for modal cool; natural minor for blues-influenced jazz ballads.

How to Generate Locrian Mode Prompts Using RaagEngine Expert Mode

Flat 5th encoding · extreme genre targeting · disambiguation from Phrygian

RaagEngine's Expert Mode includes Locrian with the full flat 2nd + flat 5th encoding — the disambiguation from Phrygian that most manual prompts miss. The generator also handles Locrian's limited genre range by providing the correct vocabulary for each: extreme metal, horror, avant-garde, dark ambient.

Step-by-step for Locrian mode: Go to raagengine.com and open the generator. Click the Expert Mode tab. In the Scale / Mode dropdown, select Locrian. Choose your Root Key — B Locrian for most contexts (built from C major, most trained), E Locrian for metal (familiar root for guitar), C Locrian for avant-garde jazz. Select your Genre — 'extreme metal,' 'horror film score,' 'dark ambient,' 'avant-garde jazz,' 'experimental.' Set your BPM precisely. Click Generate.

RaagEngine's Locrian prompt explicitly encodes both flat 2nd and flat 5th, references the diminished tonic chord, and includes the tritone interval instruction. For horror film scores, it adds cinematic vocabulary (dread, unresolved, supernatural). For extreme metal, it adds production context (downtuned, distorted, crushing). Visit raagengine.com for full Expert Mode documentation and the latest Locrian genre presets.