This song is in the A key. I have simplified it such that you only need 4 chords on the right hand to play the whole song. This 4 chords are the 3 basic chords of the A key, i.e., A, D and E chords; and the G chord.
There are basically 2 different chord progressions, one for the verse and the other for the chorus.
The progression of the verse goes like this:
I –> V/7 –> VIm7 –> VIm7/5 –> IV –> I/3 –> I/5 –> -I –> IV/5 –> V
Please refer to “The Minus-One Chord” for the “-I” notation in the progression above.
In the A key, this is translated into…
A –> E/G# –> F#m7 –> F#m7/E –> D –> A/C# –> A/E –> G –> D/E –> E
The chorus goes like this:
I –> VIm7 –> IV –> V (2x)
VIm7 –> VIm7/5 –> IV –> IV/5 –> V
In the A key, this is translated into:
A –> F#m7 –> D –> E (2x)
F#m7 –> F#m7/E –> D –> D/E –> E
The F#m7 chord is played as A/F#, i.e., A chord accompanied by F# bass note. Refer to “The 3 Minor Chords” post for the improvisation.
Here is the video…