Assertion: zeppelin's song | /r/HasProperty | gallows pole
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text: The band wrote most of the material themselves, but as with prior records, included two songs that were re-interpretations of earlier works: "Gallows Pole", based on a traditional English folk song, by way of American singer Fred Gerlach; and "Hats Off to (Roy) Harper", a reworking of a blues song by Bukka White.