The artists who's performances you anticipate and are praised by fans worldwide. The ones who bring the fire and the ice every time they hit the stage.
1.Beyonce
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2.Fantasia
3.Usher
4.Britney Spears [when she sings live]
5.Chris Brown
Not really a huge fan of hers, but I think P!nk is great live and she's always coming up with ways to raise the bar.
I gotta say, though, most rappers are boring as HELL live (especially Lil Wayne, and from what I've seen so far, Drake), but Nas, Jay-Z and Kanye (excluding his 808s & Heartbreaks material) really set the stage on fire.
And as far as bands are concerned, I think a few of the best at performing are The Killers, Foo Fighters, and Evanescence.
