Hey cool, The National are doing "The Rains of Castamere"
Halfway through Feast atm. Does this song contain spoilers? I don't see anything when I look at the lyrics. I wouldn't read the comments obviously.
As long as you only listen to the song itself, it's completely safe and refers to an event that took place before the books started. The details of the song are a minefield of spoilers, though.
And for anyone as far as Menji in the books: The spoiler attached to this is in Storm. Even in the spoilers I won't get too specific, but it's played at a certain wedding.
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"One toot on this whistle will take you to a far away land."
-Toad, SMB3