"Since you have owned this stage for your entire career, we thought we'd give you a piece of it. So this was removed from the stage earlier this week," Gelb said before bestowing a chunk of flooring.
Then he presented Domingo his leather jacket from a 1990s performance of Verdi's Otello, which had been dipped in gold to mark the golden anniversary.
"This puts you and Elvis in the same class," Gelb said.
Domingo's wife Marta, son Alvaro and two grandchildren looked on as a montage of Domingo's career was shown, including a scene from Sesame Street with Miss Piggy.
"The generations go, go, go. I'm very happy to be surviving," Domingo said.
A few bouquets of flowers were thrown from the audience.
"There are some of you that you were at my debut," he said. "You are the judges. You are the ones that make an artist. So thanks to you I have been coming for a half-century."
A tenor for most of his life, Domingo switched to baritone parts about a decade ago. He has sung 150 roles, by his count.
Domingo received a standing ovation of about 2 minutes when introduced. Four famous colleagues were among the audience: Martina Arroyo, Sherrill Milnes, Teresa Stratas and James Morris.
- AP