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Are you sure about this? If so, can you provide a reference for this? I understand that guitarists can play ambiguous or unambiguous chords. C-E-G would be a Cmajor unambiguous chord even if no bass player is present.

How do you know it's not Em(add#5) (?)
Or for that matter an inversion of D11, whether minor or major?

What key is the song?
What was the previous and next chord?
Those two questions can be important when determining how to refer to the chord..
I'm talking strictly from a theory point of view, not everyday use of a C chord (or G Bb D, or whatever it was), C just seems to be the prevalent choice.
What key the example is in doesn't matter.

Here's an example:
Song is in D
Guitar player says the fourth chord before it starts again is a C major
In My head I'm thinking "OK" but I'm also thinking "is it really an Am7 leading back to D?"
I mean both could work, and maybe in this particular song it works better if you use C the first time thru and then Am7 the second time right before the chorus.
Point is, it's all just theory but it helps

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