A Traditional Jazz Band is a small jazz group consisting of one trumpet, one clarinet, one trombone, accompanied by drums, a double bass (or a tuba or euphonium for a marching trad band), and for the chords, either a guitar, a banjo or a piano.

They play in the New Orleans or Dixieland style. This evolved in New Orleans, Louisiana, USA, in the early 1900s, from black marching bands that played in parades and funeral processions in the city streets.

In the photo on the left, a young Dixieland bands is playing in Jackson Square, New Orleans. At right is a Dixie Jazz bar on Bourbon Street, New Orleans.