I would say that there is no copyright to the text; I would say it is still in the public domain (assuming it already was). But not the analysis or discussion, of course.
Note that sheet music seems to be a counter-example. Almost each new "engraving" is considered a new edition, with a new copyright. Even if it is a Bach or Beethoven work.
But I am not a lawyer specialising in copyright law in any country,,,,
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