Broken Bells at MHOW (03/10/10) Photos by Jon Klemm, words by Chris Hadley I’d like to welcome new Bumpershine contributor Chris Hadley, aka @showaweek, who was on hand last week to witness the NYC debut of the new James Mercer/Danger Mouse “supergroup” Broken Bells. -ed. Broken Bells at the Music Hall of Williamsburg by Chris…