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Singer Sinead O'Connor's decision to shave her head for the release of her debut album The Lion And The Cobra in 1987 has been named one of the Greatest Breakthrough Moments in the history of women in rock 'n' roll.
American magazine Rolling Stone says the 45-year-old Dubliner's shaved head look was "a personal act of defiance" which shocked her record company.
Sinead, who is currently holidaying in Mallorca with her family, is among a host of stars who features on the Women in Rock list.
The list also includes the late Donna Summer for her simulated orgasms in a 17-minute version of her 1975 hit Love To Love You Baby.
Madonna also makes the grade for writhing on the floor and flashing her knickers beneath her wedding dress during her performance at the 1984 MTV Music Award of her hit Like A Virgin.
Katy Perry is also included on the list after she Kissed A Girl in 2008 while Barbados-born Rihanna made her mark in 2007 when she opened her Umbrella and "dominated the radio all summer" with her "ella ella ella, ay ay ya" chant.
Beyoncé makes the list for her 2003 release Crazy in Love which, according to the magazine, announced "her solo ascendancy".
Britney Spears' great breakthrough moment was back in 1999 when she debuted with the video for Baby One More Time.
"What do you know: Pop music really can still piss off your parents!" said the magazine.
Punk rocker Beth Ditto is also a major breakthrough moment when she belted out Standing In The Way Of Control.
The magazine claims the song is "a passionate protest against homophobia" and claimed American radio was "too prissy to play it."
The late Amy Winehouse is included for reinventing the pop scene with her retro-Sixties soul homage, Rehab.