in no order (except for Rihanna obviously first)

-Rihanna
-Beyonce
-Mariah Carey
-M.I.A.
-Usher
-Kanye West
-Justin Timberlake

Pearl Jam
Nirvana
Red Hot Chili Peppers
The Doors
Oasis
Blur
Queen
Gwen Stefani
David Grey
Coldplay

Oh god, in no particular order.

Kate Bush
The Smiths
Rolling Stones
Depeche Mode
Siouxsie & The Banshees
Yeah Yeah Yeahs
David Bowie
Fleetwood Mac
The Knife
Bat For Lashes

It'd probably change by tomorrow, I can't really name a definitive top ten.

1. Britney
2. Rihanna
3. Madonna
4. Nicki/Lana/Bey/Pink
5. Christina/Gaga/Mariah/Gwen/Nelly(furtado)/Jlo

It may change with new album releases this year :suspect: