Moody ruminations on the fragile nature of life can be a tough sell, especially when they’re flecked with haunting moans and screams. But from the mid-1990s on, Chan Marshall has proven herself a singer and songwriter who can really get under your skin. Working under the name Cat Power, she’s earned a devoted, steadily growing fanbase that’s followed her from humble avant-folk beginnings. As much about atmosphere as they are melody, her records have also become successively richer in sound, soul and scope.