Rubin worked with Johnny Cash for the last 10 years of Cash's life, collaborating on four critically acclaimed and Grammy award-winning albums (American Recordings, Unchained, American III: Solitary Man and American IV: The Man Comes Around.) At the time of Cash's death, they were collaborating on a box set that collects many unreleased tracks from those previous sessions, as well as a best-of CD. The five-CD collection is called Unearthed.
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