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

F (133211@1)          C (x32010@1)      
You would not believe your eyes
G (320003@1)                    Am (x02210@1) 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 (133211@1)            C (x32010@1)             GI'd (320003@1)like to make myself believe
F (133211@1)              C (x32010@1)   G (320003@1)    AmThat (x02210@1)planet Earth turns slowly
F (133211@1)             C (x32010@1)            G (320003@1)      AmIt's (x02210@1)hard to say that I'd rather stay awake when I'm asleep
F (133211@1)                 C (x32010@1)        D (xx0232@1)     
'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]