….. na - na - na na na - na.
C (starting with G)
Sounds really simple, but it is not. It is in the key of C, but doesn’t start off with the root chord.
In the first line (after the intro) have noted the chord sequence, which is repeated over and over.
The chords change pretty fast and the melody note does not very often „naturally“ match with the underlying chord.
Of course this is all mainly strummed, except for the bridge.
Parts are [ A ] Verse, [ B ] Bridge and [ C ] Chorus.