I don't know the song, but what jumps out at me is a descending bass line
G from the G chord
F# - bass in the D
E - root of Em
D - 3rd of Bm
C - root of C
then
D - the add9 in C - perfect cadence into
G - root of G
F# - bass note in the G5/F#
E - root of Em with a pedal around the F#
Noteboat would know for sure
Best,
A :-)
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The guitar part is arpeggios, and it's really in the key of G all the way through - I'd mark it off as
I-V-vi-iii-IV-I etc.
The chords all stay in key, so thinking of it as a shift to the relative minor at Em isn't terribly useful - the V in Em is usually a dominant chord type (B7), but here it's a minor type, which conforms to the vi in G.
The logic behind the progrssion is pretty simple - it alternates between moving down a fourth and moving up a step:
G, down a fourth to D
D up a step to Em
Em down a fourth to Bm
Bm up a step to C
C down a fourth to G
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