I have been transposing this song for about a week now.
I have not yet finished but I will say that the song is in the key of B.
I can give you the intro:
Bsus2/C#, Bsus2/G#, F#, E2, F#/Bb, B. (repeat)
I will update as soon as I figure the rest.
Oh, and there is a bridge in there that is quite difficult. I will give you what I have on that:
Bsus2/C#, Bm7/D, Bsus2, F#/Bb, A, F#/Bb, B, E, C#/F, F#, G#, Bsus2/C#, F#/Bb, B
I hope this helps and it makes sense.
d.