Right, well let's take a wack at it then! Right, the first part
Quote:
Land of the singers Green first
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Right, well I think that refers to elves, because Elves live there.
Next part
Quote:
land of the comers and stayers second and third
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Right, well Elves went between Numenor, Valinor, and Lindon during second age and the third
The last bit
Quote:
place of departure for any that remain...
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Means that Lindon is the place to leave middle earth for any that remain (except for Legolas and Gimli, who went down the Anduin)
Does that help?