Which musical group was associated with Jelly Roll Morton?

Jelly Roll Morton was a significant figure in the development of early jazz music, and he is most famously connected with The Red Hot Peppers. This ensemble formed in the 1920s is known for showcasing Morton's unique style, which combined elements of ragtime, blues, and early jazz. The group's recordings highlight Morton's innovative compositions and arrangements, emphasizing his role as a bandleader and pianist during this pivotal time in American music history.

Each of the other groups mentioned in the choices played important roles in jazz history but were not directly associated with Morton. The Cotton Club Band is linked with the famous Harlem nightclub and entertainers such as Duke Ellington, while The Duke Ellington Orchestra and The Harlem Jazz Ensemble represent their own distinctive contributions to jazz evolution, separate from Morton's influence. Thus, The Red Hot Peppers remains the correct association with Jelly Roll Morton.