Here's the whole song in the original key :)
It's basically just Bbm - F# - C# - G# all the way through.
Bbm F# C# G#
We We don't have to worry bout nothing
Bbm F# C# G#
Cos we got the fire and we're burning one hell of a something
Bbm F# C# G#
They They gonna see us from outer space, outer space
Bbm F# C# G#
Light it up Like we're the stars of the human race, the human race
When the light's turning down
They don't know what they heard
Strike the match, play it loud
Giving love to the world
We'll be raising our hands
Shining up to the sky
Cos we got the fire, fire, fire
Yeah we got the fire, fire, fire
And we gonna let it burn, burn, burn, burn
We gonna let it burn, burn, burn, burn
We gonna let it burn, burn, burn, burn
We gonna let it burn, burn, burn, burn
[ Tab from: https://www.guitartabs.cc/tabs/e/ellie_goulding/burn_crd_ver_5.html ]
We don't wanna leave, no
We just wanna be right now
And what we see
Is everybody's on the floor acting crazy getting loco 'til the light's out
Music's on, I'm waking up
And we stop the vibe, we pump it up
And we're sober now, we've got the love
There's no secret now, no secret now, secret now
When the light's turning down
They don't know what they heard
Strike the match, play it loud
Giving love to the world
We'll be raising our hands
Shining up to the sky
Cos we got the fire, fire, fire
Yeah we got the fire, fire, fire
And we gonna let it burn, burn, burn, burn
We gonna let it burn, burn, burn, burn
We gonna let it burn, burn, burn, burn
We gonna let it burn, burn, burn
When the light's turning down
They don't know what they heard
Strike the match, play it loud
Giving love to the world
We'll be raising our hands
Shining up to the sky
Cos we got the fire, fire, fire
Yeah we got the fire, fire, fire
And we gonna let it burn, burn, burn, burn oooooh
Burn, burn, burn, burn oooooh
We can light it up, up, up
So they can't put it out, out, out
We can light it up, up, up
So they can't put it out, out out
[REPEAT BRIDGE & CHORUS TWICE]
