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| Neapolitan sixth | |
|---|---|
| Name | Neapolitan sixth |
| Othernames | Neapolitan chord |
| Quality | major triad in first inversion |
| Inversion | first inversion (sixth) |
| Typical usage | predominant chord in minor mode |
| Related | major chord, minor mode, subdominant |
Neapolitan sixth is a chromatic predominant sonority frequently built on the lowered second scale degree and voiced in first inversion, producing a major triad with a bass note a sixth above its root. It functions as a colorful predominant that often precedes dominant preparations and cadential progressions in the Common Practice Period repertoire. Composers from the Classical, Romantic, and early twentieth-century eras exploited its distinctive voice-leading possibilities for expressive modulation and chromatic color.
The sonority is a major triad built on the lowered supertonic, commonly notated as a major chord on ♭2 in major or minor keys and written in figured-bass terms as a first-inversion triad (6). In harmonic theory the chord may be labelled as ♭II6, N6, or as a variant such as ♭II6/5 when extended, and is represented in analysis alongside symbols used for predominant harmonies like IV and ii6. The bass is the chordal third, which creates a characteristic intervallic relationship with tones functioning as leading tones to dominant components and creating common resolutions to V or V/V in tonal harmony.
Use of the lowered supertonic triad appears in late Renaissance and early Baroque practices but was codified and popularized during the Classical era by composers who sought chromatic coloration, including figures associated with the musical cultures of Naples and the Italian operatic tradition. Music theorists writing in the nineteenth century adopted varied labels influenced by regional pedagogy from institutions such as the Conservatorio di San Pietro a Majella, while theorists writing in Germany, France, and England debated functional descriptions alongside practitioners like Rameau-influenced analysts and historians. The term itself reflects an association with Italian practice and the pedagogical lineage of Neapolitan schools that supplied composers and teachers to courts across Vienna, Paris, and London.
As a predominant, the chord often resolves to the dominant or a dominant preparation through conventional voice-leading: the chordal root (♭2) moves to the leading tone or mediant, the bass (the chord’s third) typically moves by step into the dominant root, and the upper voices follow standard resolution tendencies. In minor-mode contexts the lowered supertonic supplies a plaintive color resolving to harmonies linked to the V or to an applied dominant such as V/V. Its usage is frequently compared to the subdominant family and to chromatic neighbors used by composers like Mozart, Beethoven, Schubert, Chopin, and Wagner who integrated it into broader modulatory schemes and cadential formulas.
Variants include the Neapolitan in root position or with added sevenths (e.g., ♭II6/5 or ♭II7) and mixtures where the chord functions as an applied dominant or as part of chromatic mediant relationships. Related sonorities are the French sixth, German sixth, and other augmented-sixth chords that also employ chromaticism toward the dominant, and the flat-supertonic triad is linked analytically to secondary dominants, borrowed chords from parallel mode, and modal mixture practices employed by composers such as Handel, Haydn, Mendelssohn, Brahms, and Ravel. The chord can also appear enharmonically reinterpreted in late-romantic and impressionist textures associated with Debussy and Stravinsky.
The sonority figures prominently in operatic, symphonic, chamber, and keyboard literature. Examples include dramatic pre-dominant moments and nostalgic modal color in works by Scarlatti, Gluck, Haydn, Mozart, Beethoven, Schubert, Chopin, Liszt, Berlioz, Wagner, Verdi, Brahms, Tchaikovsky, Ravel, and Prokofiev. Its expressive role ranges from rhetorical emphasis before a cadence to facilitating abrupt or smooth modulation to remote keys exploited by Schumann, Mendelssohn, Mahler, and early twentieth-century innovators such as Schoenberg and Stravinsky.
Analytical treatments typically show its voice-leading in score excerpts and harmonic reductions from canonical works: the chord is routinely highlighted in movements and arias by Mozart (notably in operatic ensembles), cadential passages by Beethoven (sonata and string quartet contexts), lyric keyboard pieces by Chopin and Schubert, and orchestral transitions by Wagner and Brahms. Pedagogical editions and analytical collections by scholars from institutions like Royal College of Music, Juilliard School, and Conservatoire de Paris present annotated examples and editorial commentary tracing how the chord resolves to V or to chromatic prolongations and mediant relations. Score excerpts often illustrate standard progressions such as ♭II6–V–I and show voice-leading norms that emphasize stepwise motion and preparation of the dominant.
Category:Chromatic harmony