Music's certainly seen its share of odd-couple collaborators, from David Bowie and Bing Crosby to Nick Cave and Kylie Minogue. But no pairing has felt so strangely natural—or been quite so successful—as the one of Led Zeppelin frontman Robert Plant and bluegrass icon Alison Krauss. Having met while performing together at a Leadbelly tribute concert back in 2004, the duo cut the... More >>>