The song follows a three chord progression for the most part. The three chords, in the key of D major, being G, A and D in that order. The bass however, plays constant E, on the beat, over these changes. You can reproduce this easily on guitar by playing an open E and the above chords with it. The chords are then technically inversions of G6, A and Dadd9. Or simply E/Gmaj, E/Amaj and E/Dmaj. You know that I adore you Yeah baby Baby these fists will always protect ya, lady And this mind, oh, (guitaretab.com)