I suspect (maybe wrongly) that the suggestion it is in the key of G is incorrect.

In the diatonic scale, the intervals for an E major chord would land on a G# as the first triad. I like to think that discordance is allowed, but to me this is a little too challenging.

The only chord that comes close to suggest G Major, is the Eb which would have G natural as the first triad and include a D natural as the 7th.

Even the C7 would introduce a Bb, which would lead more to a G minor key.

Regardless, Bud, there are no stupid questions (well not on this forum anyway). Moreover, I think you've already identified that this progression is peculiar for a tune supposed to be in the the of G Major and suspect that it is incorrect.

My definite guess is E Major.


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