So iv started figuring out them expensive chords ffor the Secret Song.
the 2 relentless guitar notes are simple E and B. And the drums are doing what they do.
The first 9 piano notes:
E F# G# E D# G# D# C# G#
Verse: (Im not great at chord names so sorry if they are wrong) numbers = octave
Eadd9 : E0-E1-F#2-G#2-B2
Amaj7add9 : A0-A1-E2-G#2-B2
C#m7 : C#0-C#1-E2-G#2-B2
Amaj7add9 : A0-A1-E2-G#2-B2
Thats as far as iv got. Sorry that there isnt much but its a start. Hopfully someone with a better ear than me might be able to expand on this

Cheers guys