This is actually a few months old now, but I’ve only just listened to it and it’s put a great big smile on my face, even though Southern Gas Networks have dug up my street, my front garden and are about to rip up my living room:
Randy Bachman, of Bachman Turner Overdrive, unpicks the chord, which turns out not to be a chord at all, but two chords and a bass (so three guitars in total, as you’d expect). When they play it after the explanation, you can hear the delight in the musicians, and in the crowd. The Beatles weren’t just musicians. They were alchemists.