Which instruments were used in early New Orleans jazz bands?

Between 1910 and 1915, early New Orleans jazz bands typically utilized a specific set of seven instruments to create a polyphonic collective ensemble. These instruments included the cornet, clarinet, trombone, tuba (or bass), piano, banjo, and drums.1

Each instrument held a defined role within the group:
* Cornet: Stated and embellished the melody in the middle range.1
* Clarinet: Performed obbligato or descant lines in a high register.1
* Trombone: Provided contrapuntal asides in the tenor or baritone range.1
* Rhythm section (piano, banjo, tuba/bass, and drums): Supplied a unified harmonic foundation.1

Notably, the saxophone was not commonly used in these early jazz ensembles, only becoming a standard part of the instrumentation about a decade later.1