McCormack??   Hardly "top 20", I'd have said.

Atlantov is missing - one of the true "greats".  I wish there were a place for Charles Craig, although I appreciate he's not to everyone's taste.  In his own portfolio of roles, Graham Clark might deserve a place too?  I suspect that lead roles in Janacek, Shostakovich, Berg and Prokofiev, plus Mime, David etc, aren't what the BBC Music Mag reviewers consider "great" (ie Italian) - their loss, I think?

Otherwise it's actually quite a decent list (of tenors who recorded, and whose reputation lives on in that fashion) - I would be most happy to get recordings of any of these gents as anonymous gifts from well-wishers and admirers

The list makes quite a lot of sense, although the balance is perhaps inevitably tilted towards the recent past (I first started going to opera around 1980, and I've heard eight of the twenty live - Domingo, Pavarotti, Vickers, Gedda, Bergonzi, Schreier, Rolfe Johnson, Kraus).  But I think it's the ranking that worries me about this sort of exercise.  How, for example, can you rank Corelli (glorious voice, loads of passion, no finesse) against Pears (not the greatest of voices - and one that some people find hard to take - but incomparable sensitivity and intelligence, as well as being the vessel for some of the greatest operatic writing of the twentieth century)?  And of course there are issues of repertory and indeed longevity (what would Wunderlich have achieved if he had not died in his mid-thirties?).

Of the eight I've heard, I'd rank Bergonzi for musicianship and style in his (admittedly quite narrow) repertory and Vickers for sheer intensity on stage.  And I only heard Gedda once - in Evgeny Onegin at the ROH in around 1982, when he was obviously nursing his voice very carefully, but I've never forgotten his heart-rending performance of Lensky's aria.  One of the most magical moments of my opera-going career.