This is a great 2:00 story from John Bachman of Bachman, Turner, Overdrive band...about the opening chord for Hard Days Night.
My mistake, it’s Randy Bachman...
Great. Bachman is a great highly knowledgeable music theory and other-wise great artist!
When in the UK- came across this shop with this addition at the front door.
https://www.youtube.com/watch?v=kH19o_gcWwA
Rick Beato’s - The 20 best electric guitar opening riffs.
No 1 is at 13:55
...and it’s only 1 chord.
https://www.youtube.com/watch?v=LpY_9qY-j1g