mrstickball on 05 January 2010
Skillet:
They went from virtual unknowns at the beginning of the decade to having an album that debuted at #2 on the Billboard charts.
Skillet made Christian music relevant to mainstream listeners. They're possibly the only band that has songs being played in both churches and bars 
Family Force 5:
FFV is the evolution of rapcore. They are the first band of the second wave of rap/rock or rap/hip-hop. Very interesting stuff.
(what other music video has dancing ninjas and breakdancing hearts?)
They only qualify for half the decade, though. I've seen 'em live before, they are great live. They have a 6th member (Xanadu) that is their manager/dancer which is hilarious, live.
Back from the dead, I'm afraid.
