Second line is a tradition in brass band parades in New Orleans, Louisiana. The "main line" is the main section of the parade, or the members of the actual club with the parading permit; those who follow the band just to enjoy the music are called the "second line." The second line's style of traditional dance, in which participants walk and sometimes twirl a parasol or handkerchief in the air, is called "second lining." It has been called "the quintessential New Orleans art form — a jazz funeral without a body."
The magazine of the New Orleans jazz club The Second Line took its name from the tradition in 1949.
The style has spread beyond the confines of the city of New Orleans, although it remains most common in that area.