I am horrible at knowing who is popular or 'known' and always one that says 'have you heard of this band they are awesome!' way after the fact that everyone knows of them.
So that being said, I dig the folk sister group First Aid Kit, the group Big Data and the artist K.Flay.
"Dangerous" is among my favorite songs of the decade, but I have trouble watching parts of that video (although I admire its artsy quality).