To SuperiorSings:Gordon,in the song,is comparing lake Superior to a woman,making the word Superior a female name. In this case the lake itself. The ice water mansion is also the lake from the surface to the very bottom depth,so "Superior" (she) is singing deep from under the water. The waves,the wind,the life existing beneath etc.
Hope that makes sense to you. Later!
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Borderstone,gonna post some lines tonight!:D