What ultimately became the standard front line of a New Orleans jazz band was cornet, clarinet, and trombone.
The instrumentation and section playing of the brass bands increasingly influenced the dance bands, which changed in orientation from string to brass instruments. What ultimately became the standard front line of a New Orleans jazz band was cornet, clarinet, and trombone. These horns collectively improvising or "faking" ragtime yielded the characteristic polyphonic sound of New Orleans jazz.