What Is the Prometheus Scale?

Scriabin's invented scale — the mystic chord unfolded

The Prometheus scale is a synthetic hexatonic (six-note) scale invented by the Russian composer Alexander Scriabin (1872–1915) in the early 20th century. In C, the scale consists of the notes C, D, E, F#, A, and B♭. It is not derived from any traditional diatonic mode or folk tradition — Scriabin constructed it deliberately from his theoretical ideas about harmony and its mystical properties, building it from what he called the "mystic chord": C–F#–B♭–E–A–D (a six-note chord built entirely from stacked intervals of a perfect 4th and tritone).

The relationship between the Prometheus scale and the mystic chord is direct: when you arrange the notes of the mystic chord (C, F#, B♭, E, A, D) in ascending scale order starting from C, you get: C, D, E, F#, A, B♭ — the Prometheus scale. Scriabin used this chord and its corresponding scale as the harmonic foundation for his late orchestral works, most famously Prometheus: The Poem of Fire (1910), which is so dominated by this harmony that the scale is named after the piece.

The Prometheus scale has an unusual structure that places it between the Lydian mode and the whole-tone scale. It contains a raised 4th (F#) like Lydian, a major 3rd (E) like major, but then skips the 5th degree entirely (no G), and has a minor 7th (B♭) rather than the major 7th of the Lydian mode. The absence of a perfect 5th gives it a quality similar to Locrian's instability, but in a major harmonic context — the effect is less dark and more shimmering. On the tongue drum, the 8-tongue layout repeats C and D across two octave positions, making the 6-note scale span across the full instrument.

Cultural Origin

Alexander Scriabin and Russian Symbolism

Alexander Scriabin was one of the most idiosyncratic composers in the history of Western music — a Russian Symbolist mystic who believed music could be the vehicle for humanity's spiritual transcendence. In his early career he composed in a late-Romantic style influenced by Chopin and Liszt, but from roughly 1903 onward he began abandoning traditional tonality in favor of a personal harmonic language centered on the mystic chord. He believed certain harmonies had metaphysical and even synaesthetic properties — he associated pitches with colors and claimed to perceive music visually.

Prometheus: The Poem of Fire (Op. 60, 1910) is the fullest realization of Scriabin's mystical-harmonic vision. The score includes a part for clavier à lumières (color organ or light keyboard) — an instrument intended to project colored lights synchronized with the music, creating a multimedia experience that anticipated later light shows and multimedia art. The entire harmonic structure of the piece is built on the mystic chord, with the Prometheus scale serving as the melodic expression of that harmony. Scriabin described his ambitions for the piece in explicitly mystical terms: it was meant to invoke cosmic fire, creative energy, and spiritual illumination.

Scriabin's innovations influenced subsequent generations of composers and musicians. His exploration of synthetic scales and chords contributed to the broader movement away from traditional tonality that characterized early 20th-century music. His synaesthetic approach to music and color anticipated later multimedia art and the psychedelic experiments of the 1960s. The Prometheus scale in particular influenced French impressionists, American experimental composers, and has been explored by jazz musicians and electronic music producers interested in harmonically unanchored, shimmer-filled soundscapes.

Sound Character

Mystical, shimmering, harmonically unanchored

The Prometheus scale sounds unlike any other scale in this collection. It is not dark in the manner of Phrygian or Locrian; it is not bright in the manner of Lydian or Major. Instead, it inhabits a quality that music theorists sometimes call "suspended" or "floating" — a sound that seems to hover without gravitational connection to any particular harmonic center. Scriabin himself would have described it as "mystical" or "cosmic." In more prosaic terms, it is a scale that seems to belong to no familiar harmonic world, yet sounds organized and purposeful rather than random.

On a steel tongue drum, the Prometheus scale has a particularly beautiful quality because the instrument's sustain allows individual notes to hang in the air and combine into shimmer. Play C4 and F#4 together to hear the tritone relationship that anchors the scale — it is not the harsh dissonance of a minor 2nd, but a kind of harmonically suspended vibration that seems to point in two directions simultaneously. Add E4 for a major third over C, and then the B♭4 for a minor seventh, and you have a harmonic cluster that sounds both complete and perpetually unresolved.

Melodies in the Prometheus scale feel exploratory and otherworldly. The scale rewards slow, contemplative playing — rapid passages can sound chaotic without the familiar scalar infrastructure of major or minor to guide the ear. But at a meditative tempo, moving through C, D, E, F#, A, B♭ feels like traveling through a landscape of beautiful, shifting harmonic light: each note adds a new color to the sonic fabric without resolving anything definitively. This quality of beautiful non-resolution is exactly what Scriabin sought in his late musical world.

Scale Structure

Intervals and degrees

Degree	Note	Interval from Root
1st	C	Root (unison)
2nd	D	Major 2nd (2 semitones)
3rd	E	Major 3rd (4 semitones)
4th	F#	Tritone / Augmented 4th (6 semitones)
5th	A	Major 6th (9 semitones) — no perfect 5th
6th	B♭	Minor 7th (10 semitones)

How to Play

Tips for Prometheus scale on tongue drum

Begin slowly — the Prometheus scale rewards unhurried, meditative exploration
Play C4, E4, A4 for an unusual major-6th triad without a perfect 5th — the floating harmonic core
Strike C4 and F#4 together to hear the mystic chord's signature tritone shimmer
Try ascending C–D–E–F# slowly — that four-note sequence captures the scale's opening "major with a raised 4th" quality
Use B♭4 as a point of unexpected departure — its minor 7th quality contrasts with the major character below
Play the upper register D5 for an extended, open resolution that avoids a definitive ending
Let notes ring and overlap — on tongue drum the sustained resonance amplifies the scale's shimmer quality

Prometheus vs. Lydian and Whole Tone

Related floating scales — different harmonic galaxies

The Prometheus scale shares characteristics with two other scales known for their floating, unanchored quality: the Lydian mode and the whole-tone scale. Understanding these relationships illuminates what makes the Prometheus scale unique. Like Lydian, Prometheus has a raised 4th (F# rather than the perfect F). Both scales use this tritone to create a sense of harmonic suspension. But Lydian is a seven-note scale with a complete major-scale structure (plus the raised 4th), while Prometheus is hexatonic (six notes), skips the perfect 5th entirely, and has a minor 7th where Lydian has a major 7th. The result: Lydian floats upward toward brightness; Prometheus floats sideways into ambiguity.

The whole-tone scale is even more structurally radical than Prometheus — it consists entirely of whole steps (C, D, E, F#, G#, A#), creating a completely symmetrical, completely ambiguous harmonic structure with no half steps and no tonal gravity whatsoever. Prometheus has more structure than whole-tone (it has two half-step-adjacent pairs: E to F# is a whole step, but B♭ to C is a minor 2nd when the scale wraps around), giving it slightly more directionality than the perfectly symmetrical whole-tone scale.

For tongue drum players, the practical distinction is audible: Lydian sounds magical and ethereal but still grounded in familiar major harmony; Whole Tone sounds completely dreamlike and undirected; Prometheus occupies a middle ground — clearly organized (you can hear its beginning and end), yet harmonically foreign to the major-minor tonal system that most Western listeners internalize. It sounds intentional, composed, and mysterious — which is exactly what Scriabin intended.

FAQ

Who invented the Prometheus scale?

The Prometheus scale was invented by Russian composer Alexander Scriabin (1872–1915). Scriabin was a late-Romantic and early-Modernist composer who developed an increasingly idiosyncratic harmonic language in his later career, moving away from traditional major-minor tonality toward a personal system centered on the "mystic chord" — a six-note sonority built by stacking intervals of fourths and tritones. The scale is named after his orchestral work Prometheus: The Poem of Fire (Op. 60, 1910), which uses the mystic chord and its corresponding scale as the structural foundation throughout the entire composition. Scriabin believed his harmonic innovations had mystical and spiritual significance, associating pitches with colors and cosmic forces. He planned an even more ambitious multimedia work, Mysterium, which would combine music, color, scent, and movement — but he died before completing it.

What is Scriabin's mystic chord?

Scriabin's "mystic chord" (also called the Prometheus chord) is a six-note chord built by stacking intervals in ascending order from C: C – F# – B♭ – E – A – D. The intervals between the stacked notes are: tritone (C to F#), perfect 4th (F# to B♭), major 3rd (B♭ to E), major 3rd (E to A), and perfect 4th (A to D). The chord does not belong to any traditional harmonic system — it combines elements of dominant 7th harmony, augmented harmony, and tritone substitution in a way that resists classification. When the notes of the mystic chord are rearranged in ascending scale order from C, they produce the Prometheus scale: C, D, E, F#, A, B♭. Scriabin used this chord as both the harmonic and melodic foundation of his late works, treating it as a self-sufficient harmonic entity rather than a chord that needed to resolve somewhere else.

Is the Prometheus scale tonal?

The Prometheus scale occupies a fascinating middle ground between tonality and atonality. It is not atonal in the strict sense — it has a clear root note (C) and an organized structure of specific intervals, so it does generate a sense of harmonic center. But it is also not conventionally tonal in the major-minor sense — it lacks a perfect 5th (the interval most central to traditional tonal harmony), and its combination of major 3rd, tritone, and minor 7th does not map onto any traditional chord type or key. Music theorists sometimes classify it as "post-tonal" or "pantonal" — acknowledging a harmonic center while using a non-traditional pitch collection. In Scriabin's own theoretical framework, the scale was the expression of a cosmic harmonic principle that transcended traditional tonality. In practice, music built on the Prometheus scale sounds organized and purposeful, but harmonically foreign to listeners accustomed to major and minor scales.

How does the Prometheus scale relate to the whole-tone scale?

The Prometheus scale and the whole-tone scale are related in their shared quality of harmonic suspension and their departure from traditional diatonic structure. The whole-tone scale (C, D, E, F#, G#, A#) consists entirely of whole steps — every interval in the scale is two semitones, creating perfect symmetry and total harmonic ambiguity. The Prometheus scale shares the first four notes with the whole-tone scale (C, D, E, F#), but then diverges: instead of continuing with G# and A#, it moves to A natural and B♭. This gives the Prometheus scale two features the whole-tone scale lacks: a major 6th (A over C) that suggests a relationship to major harmony, and a minor 7th (B♭) that introduces a blues or dominant-7th color. The result is a scale with more harmonic personality than the completely neutral whole-tone scale, yet still retaining the floating, directionless quality of non-diatonic pitch collections. Both scales were beloved by Impressionist composers for their ability to dissolve tonal gravity.

Prometheus Scale