The song is D'yer Maker, a play on Jamaica not Dier maker. I can't remember if it's from "Led Zeppelin III" or "Houses of the Holy".

Roger, interesting response, I am not quite sure how I sit with this one. Early Zeppelin was almost exclusively Blues, many of their songs were covers of Blues Classics. Zeppelin III has a lot of very interesting acoustic songs, deeply rooted in both American and British Folk, and probably was the introduction for many people to these varied musical styles.