So , with these two guitars you have bass - fairly simple stuff here, a lot of root notes except for the 'when I was a boy' bit, where the bass plays on the 1st 3rd and 5th of the chords. Add drums, and harmony vocals and you've got it. I just recorded a cover of this on 8-track, and stuck pretty much to the original sound. I double tracked that riff to give it more edge, and added a few more vocals, but it sounded very good. As a point of interest, check out the cymbals on the original. (azchords.com)