The musical collaboration of the decade, Raising Sand is the sound of two iconic figures stepping out of their respective comfort zones and letting their instincts lead them across a brave new sonic landscape. Despite hailing from distinctly different backgrounds, Alison Krauss and Robert Plant share a maverick spirit and willingness to extend the boundaries of their respective genres. This spirit, expertly honed by producer T Bone Burnett, has resulted in an album pitched three steps beyond some cosmic collision of early urban blues, spacious West Texas country, and the untapped potential of the folk-rock revolution.