What role did the cornet play in a New Orleans jazz ensemble?

In a New Orleans jazz ensemble, the cornet served as the primary melodic voice within the polyphonic collective. Its specific role was to state the thematic material—the tune—in the middle range, occasionally embellishing the melody as the ensemble played.1

While the ensemble relied on simultaneous, harmonically linked lines, the cornet occupied the foreground of this arrangement. It functioned alongside the clarinet, which provided high-register obbligato or descant lines, and the trombone, which contributed contrapuntal asides in the lower registers. This structured division of labor allowed the group to create a coherent, improvised sound that defined the early New Orleans style.12