“A full rehearsal the day before a show?” McBride said. “That’s a lot in the jazz world.”

José Rivera pointed at the space between two clusters of seats. “From here to here, it’s 6-foot 4,” he announced, bending to scrutinize his yellow tape measure. “From here to here is 6-foot 1.”

That made the grade: According to state rules, the distance between audience members had to be over six feet.

He and another facilities employee, Steven Quinones, had been arranging the chairs for some two hours, ensuring that the setup matched a detailed paper diagram.

“And see, this is the big aisle that people walk through, so it’s 9 feet, 5 inches,” Rivera continued, raising his voice to be heard over the whirring of a third colleague zooming around the room on an industrial floor scrubber.

Five floors up, Josh Phagoo, an operations engineer, checked up on one of the Shed’s most important technologies for Covid safety: the HVAC system. Massive air handlers and chillers in the building’s engine room whirred constantly as Phagoo made sure the machines that keep the air at roughly 70 degrees Fahrenheit and the humidity at 50 percent were functional.

On the stage itself, the first piano notes of the day were vibrating through the air, up to the McCourt’s 115-foot ceiling.

Stephen Eriksson had arrived at 11 a.m. to tune the gleaming Steinway grand piano. While he said his business had disappeared for the first four months of the pandemic, now he is busier than ever.

For nearly 30 minutes, he used a tuning wrench to make sure that the piano was concert ready. Afterward, he played a bit of Debussy and “Twinkle, Twinkle, Little Star.”

“That’s a bit of pure indulgence,” he said.

Within 15 minutes after arriving at the Shed, Fleming — who was scheduled for her second vaccine in New York the morning after the show — got the rapid Covid test in her dressing room. Negative.

Afterward, she rehearsed onstage with the musicians, their instruments positioned more than six feet apart from one another, while an audio crew member in a mask and a face shield flitted around them, making sure everything was working properly.

The six-person crew working the show was slightly smaller than usual, according to Pope Jackson, the Shed’s production manager. Everywhere they went, they brought along what Jackson referred to as a “Covid cart,” which contained a stock of masks, gloves, sanitation supplies and brown paper bags, which the musicians’ union requires so that players have a clean place to put their masks while they perform.

Downstairs, a staff of eight security guards had their nostrils swabbed to make sure that they tested negative.

Fleming and the musicians had been doing virtual and outdoor concerts throughout the pandemic, but the security staff was filled with people whose careers had been even more upended.

Allen Pestana, 21, has been unemployed for more than a year after being let go from working security at Yankee Stadium; Duwanna Alford, 53, saw her hours cut at a church in Morningside Heights; Richard Reid, 33, had worked in April 2020 as a security guard at a field hospital in Manhattan, where he had tried to forget his health fears and focus on the hazard pay he was receiving.

This was the moment before a concert where the theater was alive with preparation and nerves — a bustle missing in the city during the first year of the pandemic.

“It’s like doing the electric slide, the moonwalk and the bachata all at once,” Jackson said of the minutes before showtime. “But when the lights go up, it all fades away.”

The front-of-house staff had only 20 minutes to review the audience members’ IDs and Covid-related documents; take their temperatures; and show them to their seats.

Icy gusts of wind just outside the doors weren’t making things any easier.

But by 8:05 p.m., 150 people had settled into their precisely placed seats, able to snap a photo of the QR code on the arms of the chairs to see the concert program.

In between performances of the jazz classic “Donna Lee” and “Touch the Hand of Love,” which Fleming had once recorded with Yo-Yo Ma, the artists chatted onstage about what they’d been doing with their lives for the past 13 months.

“Wishing this pandemic would be over,” McBride said.

Tepfer said he had been improving a technological tool that made it easier for musicians to play in unison over the internet — a tool that he and Fleming had used to rehearse together virtually.

Frisell had not performed for an indoor audience since the beginning of the pandemic. “This is such a blessing,” he said.

The show ended with a standing ovation, and then the musicians played an encore: “Hard Times” by Stephen Foster, which Fleming described as a song that tends to resonate in times of crisis.

“Hard times,” she sang, “come again no more.”

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Gustavo Dudamel, Superstar Conductor, Is to Lead Paris Opera

In a coup for the venerable Paris Opera, founded in 1669 by Louis XIV, the company announced on Friday that the superstar conductor Gustavo Dudamel would be its next music director.

The musical leader of the Los Angeles Philharmonic since 2009 and the rare classical artist to have crossed into pop-culture celebrity, Dudamel has led only a single production in Paris: “La Bohème,” in 2017. And while he has dipped his toe into the operatic repertory in Los Angeles, at the Metropolitan Opera and elsewhere, he has been largely known as a symphonic conductor.

But another big appointment will come as little surprise to those who have watched Dudamel rise steadily over the past 15 years. The new position is a milestone in the heady career of an artist who made his name as a wunderkind with orchestras in North and South America and who is now, at 40, taking the reins at one of Europe’s oldest opera companies. His tenure will start in August, for an initial term of six years, overlapping for much of that period with his position in Los Angeles, where his current contract runs through the 2025-26 season.

Dudamel — who was born in Venezuela in 1981 and trained there by El Sistema, the free government-subsidized program that teaches music to children, including in some of its poorest areas — occupies a unique position in music. He is sought by leading orchestras, including the Berlin Philharmonic and Vienna Philharmonic. But he also appeared in a Super Bowl halftime show; was the classical icon Trollzart in the animated film “Trolls World Tour”; is conductor of the score for Steven Spielberg’s upcoming film version of “West Side Story”; and inspired a messy-haired main character in the Amazon series “Mozart in the Jungle.” In 2019 he received a star on the Hollywood Walk of Fame.

started last fall — has expanded its audience in recent years, but still faces the pressure of roiling debates about racial representation and the relevance of expensive-to-produce classical art forms.

It is no longer the norm — especially outside German-speaking countries — for opera music directors to start as pianists and singer coaches and work their way up through the company ranks, as Philippe Jordan, 46, Dudamel’s predecessor in Paris, did. While Dudamel lacks that preparation, he is not unknown in major opera houses. He made his debut at the Teatro alla Scala in Milan in 2006, when he was in his mid-20s, and at the Berlin State Opera the following year. He first appeared at the Vienna State Opera in 2016, and at the Met in 2018, with Verdi’s “Otello”; on Wednesday he finished a run of “Otello” in Barcelona.

In Los Angeles, he has contributed to the Philharmonic’s robust educational outreach, especially the Youth Orchestra Los Angeles, a program inspired by El Sistema that was founded in 2007. He also continues to hold the post of music director of the Simón Bolívar Symphony Orchestra of Venezuela, but after he criticized the government there in 2017, the country canceled his planned international tour with that ensemble.While he has not been able to perform with the Simón Bolívar since then, he still works with the ensemble remotely and has sometimes met outside Venezuela with groups of its players.

Dudamel’s appointment comes two months after the release of a report on discrimination and diversity at the Paris Opera, focusing on changes to the repertory, school admissions process and racial and ethnic makeup of its in-house ballet company.

Around the world, opera companies, too, have been called on to make their staffs, artistic lineups and repertories more representative. Alongside Ching-Lien Wu, the Paris Opera’s newly appointed (and first female) chorus master, Dudamel’s hiring is part of an effort to change the face of the company’s executive ranks and how it thinks about diversity and equity.

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