best artists in the last 15 years

There are so many. Hope I don't miss the key ones

Radiohead
The white stripes
Spoon
The Black keys
Ryan adams
Conor Oberst (Bright eyes)
Wilco
The flaming lips
The future sound of London (93+)
Goldfrapp
Basic Channel
Boards of Canada
Air
Death cab for cutie
Did I say The Black Keys? ;-)
Pole (Arty dub)
Deepchord( Dub made simple)
Massive attack
Bjork
Cat Power
Amon Tobin- there is nothing else like him
Tory Amos
Autechre- There is nothing else like them
Biosphere
Coldplay
Brian Jonestown Massacre
Medeski Martin and wood
Bill Frisell (could be more than 15 years)
The Raconteurs
Norah Jones
Stereolab ( unique)
Little Wayne
The Roots
Low
Dixie Chicks
Ladytron
Kings of Leon (highly underrated)
Beck
Sigur raus
Belle and Sabastian
The Kills
Tom Waits
M.I.A
K&D
Daft Punk
The Chemical brothers
Aphex twin ( could be more than 15 years)
mum
Elliot Smith

These aren't in my top 15 necessarily but with a quick scan they didn't catch my eye:
Alexi Murdoch
Anjelique Kidjo
Carolyn Wonderland
Brett Dennen
Teddy Thompson
Radney Foster
Gomez
KT Tunstall
James Hunter
Ozomotli
Nickel Creek
Jakob Dylan
Ryan Adams
Kasey Chambers
Gabriel Y Rodriquez
I'm sure a few are previously mentioned but just to expand the list.

Vienna Teng

radiohead, the white stripes.

William Topley