The basic chords in this Acoustic Remix of Fireflies by Owl City Are F C Am D G

F            C        
You would not believe your eyes
G                      Am   x2
If ten million fireflies lit up the world as i fell asleep
'Cause they'd fill the open air
And leave teardrops everywhere
You'd think me rude but I'd just stand and stare
 
Repeat through every verse

[Chorus:]

F              C               G
I'd like to make myself believe
F                C     G      Am
That planet Earth turns slowly
F               C              G        Am
It's hard to say that I'd rather stay awake when I'm asleep
F                   C          D       
'Cause everything is never as it seems

'Cause I'd get a thousand hugs from ten thousand lightning bugs
As they tried to teach me how to dance
A foxtrot above my head
A sockhop beneath my bed
A disco ball is just hanging by a thread

[Repeat Chorus]