"Jimmy Page and Robert Plant constructed the song in 1970 at Bron-Yr-Aur, a small cottage in Wales where they stayed after completing a gruelling concert tour of North America. John Paul Jones also received a writing credit for the song. It was later recorded at Headley Grange in 1970, using a mobile studio belonging to the Rolling Stones. It was finished off at Island, London and Ardent Studios, Memphis, Tennessee.
Drummer John Bonham played spoons and castanets on the recording.Bassist John Paul Jones played an acoustic five-string fretless bass. Jimmy Page's 1971 Martin D-28 guitar, in this song, is tuned to open D with a capo at the 3rd fret.
Led Zeppelin also recorded the song as an electric blues rock instrumental, "Jennings Farm Blues", which later surfaced as a studio out-take on a number of Led Zeppelin bootleg recordings. Jennings Farm is the name of the property on which the Plant family stayed in the early 1970s"
You'll recognize most of the riffs from Bron-Yr-Aur Stomp on LZ III (Strider's Song)