In the music video for “Electric Blue,” Arcade Fire multi-instrumentalist and sometimes-frontwoman Régine Chassagne takes a stroll down Napoleon Avenue, walking, wiggling and singing her way through the aftermath of an unnamed Mardi Gras parade. While most New Orleanians will find a familiar sight in the hodgepodge of broken plastic beads, flashing police lights and clean-up crews, Arcade Fire sees something else. Namely the juxtaposition of beauty and alienation that has been a...