Louisiana blues is a genre of
blues music that developed in the period after World War II in the state of Louisiana. It is generally divided into two major subgenres, with the
jazz-influenced
New Orleans blues based on the musical traditions of that city and the slower tempo
swamp blues incorporating influences from
zydeco and
Cajun music from around
Baton Rouge. Major artists in the New Orleans tradition include
Professor Longhair and
Guitar Slim and for swamp blues
Slim Harpo and
Lightnin' Slim. Both genres peaked in popularity in the 1960s and were covered by a number of rock artists. Interest declined in the later 1960s but there have been occasional revivals since the 1970s.