In the banter for The Arrogant Worms song, "Mounted Animal Nature Trail", they imply Northern Ontario contains only one woman: "There are thirteen people who live there, all of whom are named Frank. Even the girl."
Chvrches has lead singer Lauren Mayberry, who is the only female member of the trio.
Evanescence: Amy Lee was the only female member, that is until 2015 when guitarist Jen Majura joined the band.
In This Moment: Frontwoman Maria Brink is the only female member throughout the entire history of the band.
Make Them Suffer features Louisa Burton, the keyboardist and clean vocalist who is the only female member of the current lineup. Before her was Heather Menaglio, who left the band was replaced by Louisa.
In The Protomen's Rock Opera album series (based on Mega Man), there's several main male characters, like Dr. Wily, Dr. Light, Mega Man, Protoman, and Joe. The first female lead, Dr. Light's girlfriend, Emily, is introduced for Act III.
Jefferson Airplane is a Rock band, which began with six men. While some members left and were replaced, iconic front-woman Grace Slick was introduced in time to be part of the classic line-up, with the release of their 1967 album, Surrealistic Pillow.