In the age of the downloaded single, The Antlers had an unlikely hit with their 2009 concept album Hospice.   The main storyline is about coming to terms with the death of a friend.  But the music isn't what you'd expect – it's not morose and spare, it's big and lush. The Antlers have lightened up some, subject-wise, but their new album, Burst Apart, is still rich and complex.   Kurt Andersen talks with the band's leader Peter Silberman and the band plays live in the studio.