After listening to your file, I would say the chord the player played is not at all 'discordant', it's just a little flair with a quick G chord for interest. To my ear it is completely harmonious with the chords you wrote.

Something discordant there would be a C# chord etc. but what the artist played is in my opinion very tasteful and even necessary to avoid sameness.

If you don't like it, audio editing may be the answer here, and you swap out that bar for another.



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