I'm pretty sure this line is something along the lines of "We must remember our vows to Shor's single son."
Thanks for Cipher for deciphering a lot of usefull information and posting it here. Your job is so much appreciated that I came back from read-only-mode after over 5 years. Regarding the lyrics in Skyrim theme, I suppose I have now a closest approximation available (after reading this forum and searching through various others and listening to the music - offcourse...
Dovahkiin
Dovahkiin
For the sake of Skyrim
For the land, for our home
For Hrothgar's blood
For the
Nords and our wow
to Shor's single son
Dovahkiin, our king,
who'll dawn with fire!
I am not sure of the Nords-word as anything tends to sound like the writing if you have the words visible when listening to the music. Anyway at the end of Bethesdas pod-cast: http://bethblog.com/index.php/2010/12/16/the-bethesda-podcast-episode-6-enter-the-dragon/
you'll find the complete song without the narrators voice. Thanks also to Fiore as many in the web have suggested a verse:"...for sole single son" (which does not make sense) but as you suggested and Cipher explained, it must be Shor.
Please feel free to disagree as I cannot any more listen the song objectively without thinking I have it right.
Anyway, I hope (and suppose) we will see the lyrics in February's GI.