Well on guitar he basically plays arpeggios or rocks back and fourth between the tonic and the perfect fifth, so if the chord was D major, on piano I would play D A D A D A D A every eight beat and every first beat D (the tonic) with the left hand for depth of the chord. There's a link to the chords are below, or you could just search for sheet music. Hope this helped!www.ultimate-guitar.com