6. “Polly Come Home” (Robert Plant and Alison Krauss Raising Sand, 2007)
Though it did derail the Zeppelin reunion, there’s no doubt the Raising Sand album was a career highlight for Plant and his hushed vocals and harmonized leads with bluegrass star Krauss were something fans had never heard from him before.
5. The Honeydrippers “Sea of Love” (Volume One, 1984)
Plant went incognito for this ’84 project which found him revisiting some of his favorite R&B standards from his youth. This song, which became a hit, shows his increasing mastery of the ballad form, which he would ride into the future as his voice matured.