I've shared how I loved this, with Joyce Didonato and Elza van den Heever from the Met's production:
A video made the rounds shortly after JDD sang Maria Stuarda at the Met integrating her Maria Stuarda with her Elisabetta for a very interesting confrontation scene indeed, but of course, I can't find it today. If you can, please send me the link!
I stumbled upon this clip this week, with dear Beverly Sills and Eileen Farrell (audio only, alas):
Monterrat Caballe, Bianca Berini, Armando Gatto conductor. Teatro del Liceo de Barcelona. January 6, 1979
As a great admirer of both Leyla Gencer and Shirley Verrett I couldn't leave this out:
Dear Coloraturafan's "Choose your favorite Vil Bastarda"