What does a 77-year-old D.J. require before playing a late-night set of disco hits?

“A hamburger,” Giorgio Moroder said a few weeks back, sitting in a dusty dressing room at Schimanski, a club in Williamsburg, Brooklyn, that caters not to Brioni-wearing bankers, but to T-shirt-clad techno enthusiasts.

There are other necessities for a man of Mr. Moroder’s age besides red meat and complex carbohydrates. “My ears are not what they used to be,” he said, sinking into a sofa. “You have to talk loud.”

At a time when Selena Gomez and Justin Bieber are having big pop chart successes with electronic-dance-music-inflected tracks, Mr. Moroder — best known as Donna Summer’s platonic Pygmalion, a co-writer and co-producer of her biggest 1970s hits — has become a kind of professor emeritus on the global party circuit.

The comeback started when Daft Punk collaborated with him on the track “Giorgio by Moroder,” which was released in 2013 on the group’s album “Random Access Memories.”

Around the time that Daft Punk won the Grammy for album of the year, Volkswagen picked one of Mr. Moroder’s early songs, “Doo Bee Doo Bee Doo,” for its 2014 Super Bowl ad. The next year, Mr. Moroder released his first album in more than two decades, “Déjà Vu,” which is chock-full of disco-y collaborations with Sia, Britney Spears, Kylie Minogue and Charli XCX. He also began popping up as a D.J. at festivals, including the Red Bull Music Academy and Coachella.

For this gig at Schimanski, part of the Smirnoff Sound Collective, Mr. Moroder was celebrating the birthday of Ms. Summer’s seminal disco classic “I Feel Love,” which, five years after her death from cancer, was turning 40.