The music of Sleigh Bells has been called a lot of things—abrasive, loud, brash, intense, metallic, even schizophrenic—but idyllic is certainly not one of them. The duo sounds like the clatter of the big city, the heat and pressure of millions of bodies crammed into a too-small space. So when singer Alexis Krauss talks about her upcoming move to a quiet, bucolic Upstate New York community with…