Led Zeppelin frontman and legendary rocker, Robert Plant, and bluegrass superstar Alison Krauss share the stage in the new episode of CMT Crossroads, which premieres Feb. 11 at 8 p.m. ET/PT. They perform their own classics as well as songs from their new album, Raising Sand. Plant and Krauss were recently nominated for a Grammy in the best pop collaboration with vocals category for the...