LOS ANGELES – SEPTEMBER 1976: Sisters and musicians Ann Wilson and Nancy Wilson of the rock band "Heart" pose for a portrait session in September 1976 in Los Angeles, California. (Photo by Michael Ochs Archives/Getty Images)
American Rock musician Nancy Wilson, of the group Heart, plays guitar as she performs onstage at Giants Stadium, East Rutherford, New Jersey, June 15, 1980. (Photo by Gary Gershoff/Getty Images)
CIRCA 1977: Ann Wilson and Nancy Wilson of the rock and roll band "Heart" perform onstage in circa 1977. (Photo by Richard Creamer/Michael Ochs Archives/Getty Images)
View of American siblings & Rock musicians Ann Wilson (left) and Nancy Wilson, both of the group Heart, during an interview on MTV at Teletronic Studios, New York, New York, April 22, 1982. (Photo by Gary Gershoff/Getty Images)
View of American siblings & Rock musicians Ann Wilson (left) and Nancy Wilson, both of the group Heart, during an interview on MTV at Teletronic Studios, New York, New York, April 22, 1982. (Photo by Gary Gershoff/Getty Images)
