"Yeah, as time went on, definitely bass, I started to think, Wow, you know? Once I realized that you didn’t have to just play the root notes. If it was C, F, G, then it was normally C, F, G that I played. But I started to realize that you could be pulling on that G, or just staying on the C when it went into F. And then I took it beyond that..... Once you realized the control you had over the band, as we talked about earlier, you were in control. They can’t go anywhere, man. Ha! Power!"
(source: https://reverb.com/news/interview-paul-mccartney-on-his-life...)
> It is F with a G on top (on the 12-string), but you’ll have to ask Paul about the bass note to get the proper story
The person who wrote it down as CMaj7 and not Emin6/C says.
"The name is there to express a feeling. If you don't know any context it can be hard to put a definitive label on a chord." - Paul Davids
EDIT: I wrote this without carefully reading the article (oops!). Author does a great job with the "adjustments"...I suspect adjusting to relative minor covers a huge amount of these issues, and the author throws in mixolydian for good measure! There will always be edge cases, secondary dominants, modulations, blah blah blah, but I suspect adjusting to include relative minors handles the vast majority of popular music.