Few have captured the feverish ?attentions ?of the indie blogosphere as wholly and ?immediately as this Brooklyn boy-girl duo, and it isn’t hard to see why. It’s as if every element of Sleigh Bells’ genre-swerving sound — primitive guitar fuzz, pastiche beats, sugar-buzz? vocals — bypasses the default snark button and burrows? directly into jaded listeners’ punch-drunk pleasure centers. Treats? Indeed. A?