I agree that Shelby Lynne has a great voice, but isn't she considered a country, not rock, artist?
As far as female rock singers, I'd have to go with Bonnie Raitt ("rock" is a marginal classification here, too), Grace Slick, Ann Wilson, and Janis Joplin. Honorable mentionn to Joan Jett.
As far as female rock singers, I'd have to go with Bonnie Raitt ("rock" is a marginal classification here, too), Grace Slick, Ann Wilson, and Janis Joplin. Honorable mentionn to Joan Jett.