Before Thom Jongkind could tell the story of the song “Narco”— the soundtrack for Mets closer Edwin Díaz and a glorious summer in Queens — he had a quick confession: He does not know anything about baseball. He knows the sport features “bags with a ball,” as he put it, and he did once play something similar during the Dutch version of elementary school gym class. But you could say he did not retain much knowledge.

“Softball, right?” he asked. “Is that not the same?”

Jongkind, 32, is one member of the music duo Blasterjaxx, the Dutch electro house group which — along with collaborator Timmy Trumpet — released the single “Narco” in the fall of 2017. The following spring, the song became the entrance music for Díaz, who was in his third season with the Seattle Mariners. Four years later, the song is a full-blown phenomenon, a pulsating, trumpet-blasting anthem that has carried Díaz to his best season in New York — and the Mets to the top of the National League East.

Mets manager Buck Showalter has delayed a late-game bathroom break so as not to miss Díaz and the trumpets. The Mets’ local broadcast on SNY went viral while creating a cinematic entrance video. One Mets official mused that the song not only changed everything for Díaz but also for the entire Mets franchise. And so, one day earlier this week, Jongkind and his partner Idir Makhlaf, 30, were on a video chat from their home base in The Hague, Netherlands, to help answer a simple question: How did three musicians — two from the Netherlands, one from Australia — create the perfect closer’s entrance song, a genre classic that stands with Metallica’s “Enter Sandman” (Mariano Rivera) or AC/DC’s “Hell’s Bells” (Trevor Hoffman)?

“It’s so funny, man,” Jongkind said. “There’s so much coincidence in this track.”

For instance: The original demo of the song didn’t even have trumpets. When Jongkind and Makhlaf first sat down to work on the track that would eventually become “Narco,” they were looking for a big sound “specifically for the dance floor,” Jongkind said, something that would be “a bit groovy in the breakdown that kept the tension going.” Which is how they started with the percussive, synthy beat in the song’s intro. But next, they layered on a calypso melody that sounded like what Jongkind described as an “Arabic flute.” It was catchy, but a little experimental.

Then, in early 2017, Timmy Trumpet — whose given name is Timothy Jude Smith — happened to be touring in Europe and had a day off. Jongkind and Makhlaf had long wanted to collaborate with Smith, so they invited him to the studio. Once there, they played some demos, and Smith had an idea: What if they took out the flute melody and he played it on the trumpet?

“I’ve been playing the trumpet all my life so I know its strengths and strong riffs stand the test of time,” Smith wrote in an email. “That’s why nursery rhymes live on for centuries. I’ve written and recorded hundreds of riffs in my lifetime, but I knew ‘Narco’ was special the day I recorded it.”