To all the people in the world who were disappointed by Arcade Fire winning the Grammy for Album Of The Year purely because they had never heard of Arcade Fire before:
At least the award for Best New Artist has some loose criteria. Apparently the nominees have to have been heard of by a fair amount of people. For example, the winner of that Grammy, Esperanza Spalding, is hardly a new artist. She has released three albums under her own name, the first of which came out in 2006. That’s 5 years ago! A nominee, Drake, has released music as early as 2006. Florence & The Machine released singles in 2008. (Granted, it was in the UK, so how can we be expected to know about that?) Mumford & Sons toured the UK in early 2008.
Some are relatively new. But ask their fans and you might get a different answer.