Did that haunting lilt in the end credits of last night's new "Game of Thrones" episode sound familiar?

That's because the singer was the ethereal Florence Welch of Florence + the Machine, whose new song "Jenny of Oldstones" debuted in the closing credits of "A Knight of the Seven Kingdoms."

The new track is first heard in the episode itself, as character Podrick Payne (Daniel Portman) sings the ballad in Winterfell.

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According to The New York Times, the song will be the last end-credits track by a contemporary band featured in GOT. Previously, the Hold Steady covered "The Bear and the Maiden Fair" and the National covered "The Rains of Castamere."

Showrunners David Benioff and Dan Weiss had actually first approached Welch about singing "The Rains of Castamere" for GOT back in Season 2, but her group declined (and Welch says she doesn't even remember the offer!).

Since then, she's become a fan of the show.

But she didn't get a sneak peek at the script in return for her work.

"They keep such a tight ship on 'Game of Thrones,' they didn't tell us what the visual would be," she said to the NYT. "We weren’t told what’s going to happen in the episode. We weren’t even told what the episode is called. It was all so top secret, so cloak-and-dagger! When I heard it, it evoked something quite strongly in me — you can kind of feel that there is a presence in that song, like something that had history."

Exactly who is the mysterious Jenny of the Oldstones? 

There's only four episodes left to find out for sure.

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