Their engines powered by dueling male-female vocalists, San Francisco's Jefferson Airplane blended psych-rock's exploratory jams with pop's hooky brevity. Their canny experimentalism opened the door for the tension-filled rock of Fleetwood Mac and Heart in the '70s, and in later decades their inventiveness could be heard in The New Pornographers' sunshine-bright power pop, Mazzy Star's fuzzed-out twang, and Siouxsie & The Banshees' darkly moody goth.