The pure-piped bluegrass star found mainstream success with Raising Sand, her Grammy-sweeping 2007 album with Robert Plant. Reunited with her longtime band, though, Krauss sounds unworried about pleasing new fans here: Exactingly performed and lushly produced, Paper Airplane exudes a bone-deep tranquillity even when Krauss describes, as on ''Lay My Burden Down,'' the feel of ''cold clay against my skin.'' B
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