'Dixieland' is a particular style of what genre of music?

Dixieland, sometimes referred to as hot jazz or traditional jazz, is a style of jazz based on the music that developed in New Orleans at the start of the 20th century.

One of the first uses of the term "Dixieland" with reference to music was in the name of the Original Dixieland Jass Band (which shortly thereafter changed the spelling of its name to "Original Dixieland Jazz Band"). Their 1917 recordings fostered popular awareness of this new style of music. At that time, there was no issue of subgenres of jazz, so "Dixieland" referred to the band and not the music.

A revival movement for traditional jazz, formed in reaction to the orchestrated sounds of the swing era and the perceived chaos of the new bebop sounds of the 1940s (referred to as "Chinese music" by Louis Armstrong), pulled "Dixieland" out from the somewhat forgotten band's name for the music they championed. The revival movement included elements of the Chicago style that developed during the 1920s, such as the use of a string bass instead of a tuba, and chordal instruments, in addition to the original format of the New Orleans style.