This song is based on the Reynes of Castamere, one of two houses extinguished "root and branch" by a young Tywin Lannister. The other house was Tarbeck of Tarbeck Hall. Some years later, Tywin, sensing dissent from Lord Farman of Faircastle, sent a player with a lute rather than a letter as a reminder of what befalls any who go against the power of Casterly Rock.
The song is as follows:
And who are you, the proud lord said, that I must bow so low?
Only a cat of a different coat, that’s all the truth I know
In a coat of gold or a coat of red, a lion still has claws,
And mine are long and sharp, my lord, as long and sharp as yours.
And so he spoke, and so he spoke, that lord of Castamere,
But now the rains weep o’er his hall, with no one there to hear.
Yes now the rains weep o’er his hall, and not a soul to hear.