If we're talking about Legendary status, look no further than Taylor Swift."Pretty good" doesn't pack 100 thousand people into a venue. By "rockstar" I'm talking about Robert Plant in his prime or Chris Cornell or Layne Staley. Or the Beatles with throngs of crying young women passing out at the front of the stage due to the push/pull of the natural male/female dynamic. It's just a completely different "aura" than Stevie Nicks or Joan Jett or Heart or Pat Benetar. And there is no comparison between a band with a female front "man" like Garbage (or Evinescence) in comparison to Cobain fronting Nirvana. Women just don't have the raw creativity, passion, talent, and testosterone necessary to pack a 100 thousand screaming fans into a park in Rio and level the place with a legendary performance that reverberates through the halls of humanity for decades.
I'm not saying an excessive passion for rock music and rockstars is healthy within a spiritual context, but no, women cannot be rockstars in the traditional sense of the word. They no doubt can be creative and great musicians (Joni Mitchell), but if most people around the world were to list their top ten favorite bands or artists or albums there would be very few females within that list.
For example, when will a woman guitar player or rock musician ever reach the heights of originality and legendary status as Jimi Hendrix? Correct Answer: Never.
Her new album sold 4M in the first day alone. Her nose bleed seats fetch $1k.
She's the reason that new guitar sales have skyrocketed in the last 10 years (not since the likes of EVH).
Sure she has a team of song writers and Coca Cola level of marketing, but she's bigger than any music star since Michael Jackson.
If we're talking about just pure talent, sure cross her off (though she is quite talented), but in terms of Rockstar/Legendary, she's there.