Etta James was equally adept at slinging bluesy growls, slow-burn ballads, and room-filling wails, and her disciples have followed her powerfully earthy example. Adele nails James' smoky swagger on “Rumour Has It,” while Janis Joplin echoes her volcanic potential on the soul-licked “Cry Baby.” And Amy Winehouse masterfully matches her confident, prowling cool on the slinky throwback “Back to Black.”