I sadly report the passing of one of the greats, Cesare Siepi, at age 87. His 50s interpretation of Don Giovanni, thankfully captured on film, remains my favorite performance of that work. Here's a few YouTube clips, two of the Don, a third from Verdi:
Don Giovanni Act 2 Finale, Party scene until just prior to the Commendatore entrance.
Don Giovanni Act 2 Finale, Commendatore.
Simon Boccanegra, "Il lacerato spirito", a 1985 concert performance.