My immediate response to this was, probably not many, because we know that for instance, a Bach sounds like a Bach, and a Picasso looks like a Picasso.
But then I remembered the story of Peter Paul Biro and was less sure in my footing.
However, if someone told you that one of your favorite writer, artist, or composer’s works had just been discovered to be faked, which one would you immediately suspect? Is there one that just doesn’t quite seem right to you? A Bach that isn’t up to the usual Bach standard, etc? That perhaps a small part of you would rest easily knowing was a hoax?
(I wish I could give an answer but I’m not cultured enough! I feel like I haven’t studied any of the greats closely enough to be able to distinguish outliers.)