Over the course of five mesmerizing CDs, Unearthed shows us just how Johnny Cash's now-legendary handful of recordings for American Records came to be. Four discs feature previously unreleased tracks from the famed Rick Rubin-produced sessions. Through their inconsistencies and quirks (and, more often than not, brilliance), they shed light on how Cash's final records were shaped, edited, and produced. Here we get some creative pairings: Fiona Apple providing guest vocals on Cat Stevens' "Father & Son," and the late Joe Strummer duetting with Cash on Bob Marley's "Redemption Song."