Here's my article on the subject, written back in 2001:
Second Line Drumming - BasicsOne thing that I don't completely explain in the article is that the modern-day
Second Line is more of a march two-beat rhythm, like what you hear in "When The Saints Go Marching In". The rhythm I have notated in my article is now referred to as
Mardi Gras Indian Beat, used in tunes such as "Hey Pocky Way".