It's like Pink's new song called "Funhouse", its refrain says:
"It used to be a funhouse,
But now it's full of evil clowns.
It's time to start the countdown,
I'm gonna burn it down, down, down..."
Don't you think she's singing about Gotham?

Gotham used to be a "funhouse", a good place, but now it's full of "evil clowns" (I think this is pretty self-explanatory

), and she even mentions Alfred's quote about that burglar in Burma: "I'm gonna burn it [Gotham] down", so this is the only way to catch that burglar (and the Joker) - you know, to "burn the forest down".
Alright, that's highly unlikely that she sings about Gotham, but that refrain is still interesting

Chris Nolan Rises 20.07.2012.