How did European harmony influence jazz music?

European harmony played a foundational role in the development of jazz, serving as a key musical resource that was gradually absorbed by Black American musicians. While the rhythmic and structural elements of jazz are primarily rooted in West African traditions, the harmonic language of the genre is largely derived from European influences.12

The integration of European harmony occurred through several stages:

• Assimilation: Harmony was likely the final aspect of European music to be adopted by Black Americans. Once acquired, it was applied to religious texts, contributing to the development of spirituals through exposure to white religious revival meetings.1
• Melodic Development: While pentatonic formations in jazz stem from West Africa, the diatonic and later chromatic melodic lines evolved from European antecedents of the late 19th and early 20th centuries.1
• Harmonic Expansion: As jazz matured, musicians moved beyond simple triadic and dominant harmonies. By the 1930s and 1940s, arrangers began incorporating complex 9th, 11th, and 13th chords, substitute harmonizations, and wide-ranging modulations, significantly expanding the harmonic territory of the music.3

This synthesis of European harmonic structures with African-derived rhythms and pitch inflections remains a defining characteristic of jazz.12