This is very similar to a Blues song by Howlin' Wolf called "Killing Floor." It was so similar, Wolf was eventually given a composer credit. On the original British copies of Led Zeppelin II, the label on the record lists "Killing Floor" as the third track and is credited to Chester Burnett (Howlin' Wolf's real name), while the liner lists "The Lemon Song" and credits Led Zeppelin.
Some lyrics are from Blues singer Robert Johnson's "Traveling Riverside Blues." Led Zeppelin played "Traveling Riverside Blues" for a BBC session in 1969, but the song was never released on an album. It was placed on their Box Set in 1990, and was also a bonus track on the Coda album for the Complete Studio Recordings.
No electronic devices were used to create the echo on Robert Plant's vocal. It was made by the acoustics in the studio and by his voice.
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