Next semester I'm teaching an M.A. seminar on Milton, as well as doing an independent study with another M.A. student who has already taken both an undergraduate Milton and a graduate Spenser class--but who wants to reread both authors and get more deeply into the secondary criticism.
Now, I'm a Miltonist, after a fashion, but I usually teach Milton at the undergraduate level--with just a few critical essays or book chapters as supplements. When I teach Spenser it's only a book or two at a time, and I know nothing, absolutely nothing about Spenser criticism, old or new.
So tell me, Renaissance peeps: what criticism (articles or book chapters, or one or two entire books) would you consider essential for M.A. students to read on either author?