Robert Plant - The Rock Hard Times

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In Through the Out Door Led Zeppelin playing harmonica, vocals	Presence Led Zeppelin playing harmonica, vocals	Physical Graffiti Led Zeppelin playing harmonica, vocals
Houses Of The Holy Led Zeppelin playing harmonica, vocals, vocals (background)	Led Zeppelin IV (aka ZOSO) Led Zeppelin playing harmonica, vocals	Led Zeppelin III Led Zeppelin playing harmonica, arranger, vocals
Led Zeppelin II Led Zeppelin playing harmonica, vocals	Led Zeppelin Led Zeppelin playing harmonica, vocals