Simon Estes (above) was a renowned Amfortas, Dutchman, and Wotan, but I had never realized (til now) that he also sang Hagen in GOTTERDAMMERUNG. This audio of Hagen's Watch (in English) has just come my way. It's really impressive.
Simon Estes - Hagen's Watch ~ TWILIGHT OF THE GODS - in English - 1977 (live)