The Monkees a cappella I wanted to find the Kingston Trio's version (sung more in contemporary Spanish, I think, and with the title "Guardo El Lobo) because I like hearing this song done by just a few voices instead of a whole choir, but I couldn't find it. The Monkees' recording is quite nice.
This is the "singable" English "Translation" that accompanies this You Tube. I think the "translator" has thrown in a bit of Catholic theology that isn't stated in the original lyrics, but it's interesting to see an English lyric version that 'scans' properly. (Maybe someone can tweak the singable lyrics a bit to make them closer to a real translation.)
River, roaring river, guard our homes in safety, God has kept the black wolf from our lamb, our lady. God has kept the black wolf from our lamb, our lady.
Raging mad to bite her, there the wolf did steal, But our God almighty defended her with zeal. Pure he wished to keep her so she could never sin, That first sin of man never touched the virgin sainted.
River, roaring river...
He who's now begotten is our mighty monarch, Christ, our holy father, in human flesh embodied. He has brought atonement by being born so humble, Though he is immortal, as mortal was created.