Rihanna
SOS
Umbrella
Don't Stop The Music
Disturbia
Only Girl
We Found Love
Diamonds
Stay
Mary J. Blige
You Remind Me
Real Love
Reminisce
I'm Goin' Down
Be Happy
My Life
Not Gon' Cry
I Can Love You
Everything
Family Affair
No More Drama
Be Without You
Just Fine
Right Now
Mary, it's not even close. I mean she's one of the most acclaimed artist of her time, popularized a form of music that dominated for years, etc.
Not to mention she's influenced countless artist. How many artist have been influenced by Rihanna's work? What's the 411 alone>>>>>>>>Rihanna's poptart catalog.
But this is gayTRL. Where impact is only recognizable when you're a subpar pop girl.
Mary for one generation, Rihanna for the current one. Rihanna is still going though and has the ability to build on her impact so I'll give her a vote.