(Gravity Falls Main Title Theme composed by Brad Breeck)
[Instrumental]
(kcab srettel eerht)*
*"three letters back" played backwards
which refers to the cipher to be used to decode the message at the end of the episode.
(For episodes 1–6, it was a Caesar cipher with a left shift of 3)
Ending Theme:
Woah
Woah
Woah
Oh, woah
[Original Lyrics by Lizz Robinett]
There's something more to this
That we have missed
Things around here are suspicious
Who can we put our trust in?
What have they all been hiding?
Secrets that lie in shadow
How much do they all know?
A place so full of mystery
It's just a puzzle to be solved
There are things you should know
That I can't show
It is better if you don't know
I'm not trying to deceive you
Just trying to keep you safe so
Please trust in what I'm saying
They're coming
Keep running
Someday you'll understand but,
Remember don't look back at all
All of the rules have changed,
Nothing's the same
The portals open, wheel is broken
We ignored all the warnings
Now gravity is falling
And when the earth becomes sky
Fear the beast with one eye.
The final battle's begun
Welcome to Weirdmageddon
[Thanks to qeiben216 for correcting these lyrics]