Is there a maximum number of author for a blog?

  1. You can have as many authors as you’d like.

  2. If the artists are not the authors of the blog posts, I would consider using a custom taxonomy instead, because it would be a more accurate model.

EDIT
As it’s been pointed out in the comments, taxonomies don’t have built-in meta data, and custom post types or users are sometimes easier to handle.

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