The Greatest Band in the World
is Pile, from Boston.
I'm thinking "best band currently in its prime" here. Deerhoof, for instance, is one of the world's greatest bands, but Breakup Song was pretty weak.
Other notable contenders: Parquet Courts, Protomartyr, Future Islands, Prinzhorn Dance School, Speedy Ortiz, Swans. (Swans may just be the greatest band in the world, but they're old, so I say Pile.)
What do you think?