Re: Stanton Moore here
In a nutshell, New Orleans was the only city in America to allow African Slaves to play their indigenous music on American soil. This led to the combining of African culture and music with European instruments and music. Second Line drumming is the result of afro-Caribbean rhythms (namely clave) creeping into European-style marches that were being played in parades in New Orleans for funerals and social functions. These rhythms (rich in syncopation) found their way into New Orleans Jazz, Blues, R&B, Funk, Brass Band (Second Line) and Mardi Gras Indian music. Hope this helps. For more on the topic check out my book, "Take it to the Street"