[trackaghost]

I don't think just what's popular defines a decade's music.
Often it's the influence the act has and how it reflects popular culture.
Look at the Velvet Underground, they sold hardly anything but it's hard to think of the 60s and that whole defining Andy Warhol scene without them. In contrast Loverboy sold millions of records in the 80s but say their name to a youngster today and they would have no clue what you're talking about.

The most obvious one I can think of is The White Stripes. I think already their influence has been huge and despite the rawness of their music they've managed to transcend the alternative music scene and become a huge act. I think in the future at least two or three of their albums will be held up as examples of great albums this decade.