Chromaticism is a compositional technique interspersing the primary diatonic pitches and chords with other pitches of the chromatic scale. Chromaticism is in contrast or addition to tonality or diatonicism (the major and minor scales). Chromatic elements are considered, "elaborations of or substitutions for diatonic scale members."

As tonality began to expand during the last half of the nineteenth century, with new combinations of chords, keys and harmonies being tried, the chromatic scale and chromaticism became more widely used, especially in the works of Richard Wagner, such as the opera 'Tristan und Isolde'. Increased chromaticism is often cited as one of the main causes or signs of the "break down" of tonality, in the form of increased importance or use of:

As tonal harmony continued to widen and even break down, the chromatic scale became the basis of modern music written using the twelve tone technique, a tone row being a specific ordering or series of the chromatic scale, and later serialism. Though these styles/methods continue to (re)incorporate tonality or tonal elements, often the trends which led to these methods were abandoned, such as modulation.

Django Reinhardt (French pronunciation: [dʒɑ̃ɡo ʁenɑʁt]; 23 January 1910 – 16 May 1953) was a pioneering virtuoso Belgian jazz guitarist and composer.

Often regarded as the first important European jazz musician who made major contributions to the development of the idiom, he is also revered by guitarists worldwide as among the foremost exponents of the instrument. Reinhardt invented an entirely new style of jazz guitar technique (sometimes called 'hot' jazz guitar) that has since become a living musical tradition within French gypsy culture. With violinist Stéphane Grappelli, he co-founded the Quintette du Hot Club de France, described by critic Thom Jurek as "one of the most original bands in the history of recorded jazz." Reinhardt's most popular compositions have become jazz standards, including "Minor Swing", "Daphne", "Belleville", "Djangology", "Swing '42", and "Nuages".

Jean "Django" Reinhardt was born 23 January 1910 in Liberchies, Pont-à-Celles, Belgium, into a family of Manouche gypsies. Reinhardt's nickname "Django" is Romani for "I awake." Reinhardt spent most of his youth in Romani (Gypsy) encampments close to Paris, playing banjo, guitar and violin from an early age. His family made cane furniture for a living, but included several keen amateur musicians.