Sisters Ann and Nancy Wilson are the creative spark behind Heart, a hard rock group that initially found success in the mid-'70s, only to reach greater heights after engineering a major comeback a decade later. Their 1975 debut album, Dreamboat Annie, achieved platinum status on the strength of the hit singles "Crazy on You" and "Magic Man." Their 1978 follow-up, Little Queen, also sold over a million copies; the single "Barracuda" was a massive hit. After an early-'80s slump, the band's 1985 self-titled album sold more than five million copies and launched four Top Ten hits, including the chart-topping "These Dreams." ~ Jason Ankeny