As the lead singer of Led Zeppelin, Robert Plant has one of the most recognizable, and some have said, best voices in rock and roll. But what's totally astounding about his career is how Plant has been able to use it - from the ceiling-shaking howl of his Zep days, to his melodic harmony singing with Alison Kraus on their Grammy-winning collaboration Raising Sand, to the majestic and mesmerizing quiet of some of the songs on his latest album, Carry Fire.

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