A folk-influenced song from Led Zeppelin's third album, Led Zeppelin III.

While the lyrics are original, the acoustic guitar intro was lifted wholesale from Bert Jansch's arrangement of the traditional English folk song "The Waggoner's Lad". Jansch and John Renbourn (cofounder, with Jansch, of the band Pentangle)recorded a two-guitar, acoustic instrumental version of "The Waggoner's Lad" for Jansch's third album, Jack Orion (1966).

The Jack Orion album also includes Jansch's arrangement of "Blackwaterside," the basis for Jimmy Page's "Black Mountain Side." Page later acknowleged Jansch's influence:

At one period I was absolutely obsessed by Bert Jansch. I watched him playing once at a folk club and it was like seeing a classical guitarist... He was the innovator of the time.
But nonetheless never credited Jansch on any of Zeppelin's albums.