It's pretty simple

Power or full chords. I personally believe that power chords are the best one for this song.

Intro: A C F D x3

Yeah

AI (x02220@1)made my mistakes
CI (x32010@1)seen my heart cave in
FI (133211@1)got my scars
DI (xx0232@1)been to hell and back again

ABorn (x02220@1)for the blue skies
CWe'll (x32010@1)survive the rain
FBorn (133211@1)for the sunrise
DWe'll (xx0232@1)survive the pain

[Chorus:]
AWe're (x02220@1)singing 
CHey, (x32010@1)you can't count us out
F (133211@1)                                 DWe've (xx0232@1)been running up against the crowd
A (x02220@1)      C (x32010@1)            F (133211@1)     DYeah, (xx0232@1)we are the dark horses
AWe're (x02220@1)singing 
CWait! (x32010@1)It's not over now
F (133211@1)                                        DWe've (xx0232@1)been down but we've never been out
A (x02220@1)      C (x32010@1)             F (133211@1)    DYeah, (xx0232@1)we are the dark horses

(same chords throughout the entire song)

We found the way out
The city takes everything it can
But outside the crowds
I can feel my lungs again

Born for the blue skies
We'll survive the rain
Born for the sunrise
We'll survive the pain

[Chorus]

We're singing
La la la la la la la
La la la la la la la.

Yeah!

Born for the blue skies
Born for the blue skies
Born for the sunrise
We'll survive the pain

[Chorus:]
We're singing 
Hey, you can't count us out
We've been running up against the crowd
Yeah, we are the dark horses
We're singing 
Wait, don't care what they say
We know we'll find a way
Yeah! We are the dark horses

Yeah!

Laa la-la-la-la-laa
Laa la-la-la-la-laa

[Faded Voice:]
Keep running with the dark horses
Hope makes the blood change courses
Keep running with the dark horses
Stand up with the dark horses
Keep running with the dark horses
Hope makes the blood change courses

Hope you guys have fun with this fun! -KingOfDaStrings