Comment on imgur:
Actually that's an appropriate use, comma used for the purpose of producing a short pause to add emphasis to what follows.
Is the comma in it is, a done deed correctly used?
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Commas in writing and pauses in speech are really two different things. It is a done deed should never have a comma in ordinary writing.
In this case, the comma is not used as a part of the sentence structure, but rather to add a pause for emphasis. We see that the name of the album is Done Deed, so the artists chose to use a comma to emphasize those words in the description.