The song lyrics are here, with the following:
The black brook calls
It sings a chorus
While the gathering swells
The flames grow tall
Right before us
As drums keep pounding
And the masses now are fusing
Bodies pressed and tangled
As we revel in confusion
Our inhibitions thrown into the fire
Wiktionary lists the following meaning for the noun:
- a body of running water smaller than a river; a small stream.
- a water meadow.
- low, marshy ground.
Does this word really mean the soil, ground in this context?