“It is, a done deed” [closed]
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.