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Better known for "The King of Spain", Moxy Früvous did a truly stunning acappella/beat-box rendition of Green Eggs and Ham. Of course, it was apparently not released on a major label, and perhaps it was easier for such things to slip under the radar in those days. (Especially a Canadian group's music.)
But like the Dylan rendition, this version of Green Eggs and Ham is still floating around out there. It is worth seeking out for any Seuss fan.
http://en.wikipedia.org/wiki/Moxy_Früvous_(album)