In simple terms
Jazz is a genre of music that originated among African American communities in the United States, particularly in New Orleans, around the turn of the 20th century, built on improvisation, syncopated rhythm, and a distinctive treatment of harmony drawn partly from blues music. [1]
How it works
Improvisation, performers inventing melodic lines in the moment rather than only playing fixed, written parts, sits at the center of jazz performance. [1] Musicians typically improvise over a chord progression that the whole group agrees on in advance, which gives the music both a fixed structure and real-time unpredictability at once. Swing, a rhythmic feel that places subtle emphasis on off-beats, and syncopation, accenting notes where a listener does not expect them, give jazz its characteristic rhythmic energy. [2]
Jazz drew heavily on the blues, both its melodic phrasing and its use of certain bent or flattened notes, and combined that with the harmonic complexity of earlier American and European popular music traditions. [1] Over the 20th century it branched into many distinct styles, including New Orleans jazz, swing, bebop, and free jazz, each pushing improvisation, harmony, or rhythm in different directions.
Why it matters
Jazz is widely regarded as one of the first major American art forms to achieve international influence, and its emphasis on individual improvisation within a group structure influenced countless later genres, from rock to hip-hop. [2]
Where you’ll see it
- Live jazz clubs and concert venues around the world
- Film and television scores drawing on jazz harmony and instrumentation
- Music education programs that teach improvisation through jazz
- Later genres, such as funk and hip-hop, that borrow jazz’s rhythmic and harmonic ideas
Example
In a small jazz combo, a saxophonist might improvise a new melodic solo over the same chord changes that the pianist and bassist are repeating, producing a performance that would sound different every time it is played.
Often confused with
Blues is one of jazz’s main musical ancestors and shares some of its harmonic language, but blues is generally built around a simpler, more fixed song structure, while jazz places far greater emphasis on extended group and solo improvisation.
Key facts
- Jazz originated primarily among African American communities in New Orleans around the turn of the 20th century.1
- Improvisation, performers inventing melodic lines in real time over an agreed chord progression, is central to jazz performance.1
- Swing and syncopation, rhythmic techniques that emphasize off-beats and unexpected accents, give jazz its characteristic feel.2
- Jazz developed into many distinct styles over the 20th century, including New Orleans jazz, swing, bebop, and free jazz.2
In the news
Quick checkWhat role does improvisation actually play in a typical jazz performance?Show answer
Musicians invent melodic lines in the moment over a chord progression the group has already agreed on, so the piece has a fixed underlying structure but an unpredictable, different performance each time.
Sources
- Encyclopaedia Britannica. Jazz. Undated (accessed 1 November 2026)
- Jazz at Lincoln Center. What Is Jazz?. Undated (accessed 1 November 2026)
Editorially reviewed by Last reviewed November 1, 2026Researched and drafted with AI assistanceReport an issue