Nocturne

The nocturne is a character piece, typically for solo piano, that evokes nighttime reverie. The standard texture sets a slow left-hand pattern of broken chords against a vocally inflected right-hand melody, with frequent rubato (a flexible, expressive stretching of tempo). The form is usually loose ternary (ABA) with a more agitated central section. Tempos are slow to moderate, dynamics quiet but with sudden emotional surges.

The Irish pianist-composer John Field invented the piano nocturne around 1812, publishing a series of short, lyrical pieces that defined the genre. Frederic Chopin took the form much further from 1827 onward, composing twenty-one nocturnes that deepened the harmonic palette, added ornaments derived from bel canto opera, and pushed the central sections into more dramatic territory. Faure and Debussy later extended the genre into the early 20th century. The nocturne was a domestic and salon form first, tied to the explosion of bourgeois piano ownership and printed sheet music in the 19th century.

Treat the right-hand line as a singing voice and the left-hand arpeggios as breath. Notice how rubato lets the melody hesitate over a steady bass. The ornaments — turns, trills, written-out cadenzas — are bel canto ornament transplanted to the keyboard. Listen for the moment the music passes from major to minor or vice versa; the harmonic shadowing carries most of the emotional weight.

Begin with Chopin's Nocturne in E-flat major, Op. 9 No. 2 (1832), the most familiar example. For deeper coloring try Op. 27 No. 2 in D-flat major; for dramatic contrast Op. 48 No. 1 in C minor.

John Field's nocturnes were widely performed across Europe in the 1810s and 1820s; Chopin knew them and credited Field with the invention even as he transformed the form. By the late 19th century the word 'nocturne' had spread to orchestral music — Debussy's three orchestral 'Nocturnes' (1899) are essentially tone-paintings rather than pieces in the original keyboard tradition.