What is the minor fourteenth interval?
The minor fourteenth is the compound form of the minor seventh, stretching that interval's bluesy, unresolved quality across nearly two octaves. In practical music-making, this interval is rarely named as a "fourteenth"—musicians and theorists typically refer to any seventh-quality interval by its simple name regardless of the octave displacement. The term "fourteenth" appears primarily in formal interval identification exercises and theoretical analysis.
Despite its rare naming, the minor fourteenth's sound is everywhere in music. Whenever a bass instrument plays the root while a melody or chord tone sounds a minor seventh two octaves above, a minor fourteenth is at work. The wide spacing gives the minor seventh's characteristic tension a more spacious, less urgent quality—the dissonance is still present but spread across enough acoustic space that it becomes atmospheric rather than confrontational.
Harmonic character
The minor fourteenth retains the minor seventh's fundamental quality of gentle dissonance and forward motion, but the extreme width of the interval softens its urgency. In orchestral scoring, this wide spacing allows the minor seventh relationship to color the harmony without dominating it—the listener perceives warmth and complexity rather than overt tension.
- Compound equivalent: minor seventh + octave
- Consonance: Mildly dissonant
- Common context: Orchestral voicings, wide chord spacing
- Practical naming:Almost always called "minor seventh"
Where you'll hear it
The minor fourteenth appears in orchestral music whenever composers voice dominant seventh or minor seventh chords across a wide range. A contrabass sounding the root with a flute or violin playing the minor seventh two octaves above creates this interval, even though no one in the orchestra thinks of it as a "fourteenth." Mahler, Debussy, and Ravel all wrote voicings that span this range, using the wide spacing to create translucent harmonic textures.
In jazz big band writing, the minor fourteenth occurs between the bass and the upper voices of horn section voicings. Arrangers like Thad Jones, Bob Brookmeyer, and Maria Schneider carefully control these wide intervals to create voicings that are both harmonically rich and acoustically clear. The interval also appears in electronic music production, where synthesizer pads often span two or more octaves with seventh-based harmonies.
Practice ideas
Play a minor seventh in close position, then move the lower note down an octave to create the compound interval. Notice how the tension softens with distance while the essential character remains. Practice identifying wide-voiced seventh chords by ear, training yourself to recognize the seventh quality even when the notes are spread across multiple octaves. Compare the minor fourteenth with the major fourteenth to hear how the half-step difference carries across this extreme range.