Sisters Ann and Nancy Wilson are the creative spark behind Heart, a rock group who initially found success in the mid-'70s via guitar-heavy radio hits like "Magic Man" and "Barracuda," only to reach greater heights after engineering a major pop comeback a decade later. Drawing from progressive rock, hard rock, and folk, the band's 1976 debut, Dreamboat Annie, and 1977 sophomore effort, Little Queen, helped establish Heart as a hard-hitting hitmaking machine with both hooks and attitude.