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Britney Spears: Blackout
Madonna: Ray of Light
Rihanna: Rated R
Beyoncé: BEYONCÉ
Christina Aguilera: Stripped
Lady Gaga - Born This Way
Katy Perry - Teenage Dream
Mariah Carey - Butterfly
Taylor Swift - 1989
Avril Lavigne - Under My Skin
Blackout tbh, with ITZ coming really close. ITZ is iconic but for me Blackout gave me Britney-defining tracks that I will always love, like Gimme More, Piece of Me, Radar, etc. Perfection tbh.
I think In The Zone is close though. Blackout was just the most cohesive and weirdly seemed more personal/ genuine than any of her other albums. Plus, Gimme More is like the best song ever.
Ranking
Blackout > In The Zone > Circus > Britney > Femme Fatale > ...Oops! > Britney Jean > ...BOMT