The legendary British post-punk group Gang of Four has influenced such luminaries as R.E.M., U2 and Franz Ferdinand, but it hasn't graced a stage in its original lineup since 1981. The band has finally given fans what they want, with a new studio album, "Content," and a North American tour. The purveyors of stripped-down punk, funk and dub reggae land in the Southland for two dates, at House of Blues Anaheim on Sunday and the Music Box on Monday. House of Blues Anaheim, 1530 S. Disneyland Drive. 8 p.m. Advance $22.50, door $25. (714) 778–2583. http://www.houseofblues.com. Music Box, 6126 Hollywood Blvd., L.A. 9 p.m. $32.50. themusicbox.la.