Before last week, I was teaching people that the chord in question is a B Major barre chord. This chord is monstrously difficult to finger [I will be writing more about this chord and it's many finger permutations in a future post]. It turns out that I wasn't listening hard enough. Instead, the Beatles are playing a B7 chord. This is much easier! Whoops. Sorry to everyone I've taught this song to and messed up on. Heh!