NEW YORK, NY.- Jeanine Tesori can take apart music and put it back together as well as any composer who’s put note to paper. She can write a recitative worthy of Janacek, or a pop tune that could have charted on 1970s AM radio. She can conjure a gospel number, a tap soft-shoe, or a folk-rock confessional like a seasoned pro.

And as the co-creator of “Caroline, or Change” (now in a widely acclaimed revival on Broadway) and the Tony-winning “Fun Home,” she has helped to expand the boundaries of the American musical in a way that recalls such forebears as Stephen Sondheim and Elizabeth Swados.

But you don’t come away from a Tesori musical — not the soulful “Violet,” the jazzy “Thoroughly Modern Millie,” the snarky “Shrek the Musical,” the meta-cultural “Soft Power,” nor the offbeat “Kimberly Akimbo,” now in a well-reviewed premiere at the Atlantic Theater Company — marveling at her formal innovation.

For all her formidable tools and training, Tesori understands that “craft is the conduit for a really fresh and profound encounter with human experience,” her “Fun Home” co-writer Lisa Kron said. “It’s not an end in itself.”

Said David Lindsay-Abaire, with whom she adapted “Shrek” for Broadway, and who adapted his play “Kimberly Akimbo” with her: “She thinks like a playwright. She understands story and narrative and character, and the architecture of a scene.”

It’s not just structure she’s attuned to, said Tony Kushner, with whom she wrote “Caroline, or Change,” but subtext as well.

“She either comprehends or intuits, not what necessarily is the most obvious choice for dramatic action or dramatic events, but what’s under the surface, where the real meaning of a piece lies,” Kushner said. “I’ve never met anybody more wide open to that, or more emotionally intelligent about human beings than she is.” While that’s surely a fine quality in any person, here’s the key: “She has this absolutely uncanny ability to translate that into music.”

This is the mystery of Jeanine Tesori — of any composer for the theater, really. Where does the music come from, and how does it work its magic? A nonverbal language with the power to move us, sometimes literally, music can be wed to words and characters in ways that feel definitive, clarifying. As Lindsay-Abaire put it: “I don’t know if pure is the right word, but something less diluted. You hear the characters’ emotions and know what’s going on inside those heads and hearts,” dramatic content that in nonmusical plays “you rely on the actors to communicate.”

George Brant, with whom Tesori is adapting his play about a female drone pilot, “Grounded,” for the Metropolitan Opera, said that Tesori is “able to get at the guts of the piece and transform it into something that still feels like itself, but more.”

The question of music’s storytelling potency is sharpened in Tesori’s case because, unlike Sondheim or many of her generational peers (Jason Robert Brown, Michael John LaChiusa, Adam Guettel), she doesn’t write lyrics. Instead, she has worked with playwrights to shape not only her show’s scripts but bracingly original songs as well, in idioms and character voices as wide-ranging as the musical genres she references.

Looking at her list of collaborators, Lin-Manuel Miranda said: “It’s as if she’s made it a mission to bring every serious dramatist to swim in the musical theater pool. But the other side of that is she’s bending their skills to our art form, and innovating our art form with every at bat.

“It’s how you know she’s the best,” he added “because she works with the best and makes them sing.”

It’s not as if she has a cookie-cutter style, though. As Lindsay-Abaire said, “The fact that the lyrics are all so different — that Tony’s are Tony’s, Lisa’s are Lisa’s, mine are mine, is a testament to Jeanine embracing her collaborators and our voices. It’s not like: This is how Jeanine teaches all these playwrights to write lyrics.”

For her part, Tesori — who recently turned 60 but retains a youthful bonhomie, with “Fun Home” wallpaper patterns tattooed on her forearm — has a firm grip on what her strengths are.

“I’m not a lyricist at all, but I’ll say what my gift is: recognizing lyrics in the sea of words,” Tesori explained during a recent interview in her office at City Center, where she serves as a creative adviser. She immerses herself in her collaborators’ verbiage in various ways. She asks for what she calls “noodles,” which Kron described as “bits of lyric that didn’t make it into the lyric I built for her.” Tesori also has them read their lyrics aloud to her, sometimes “two or three times,” as Kron recalled, to glean intention from inflection.

Then, Tesori said, her mind goes to work on fragments of material, in a process she compared to the sequence in “The Queen’s Gambit” when the lead character envisions complicated chess moves on the ceiling. “Things start clicking into place,” Tesori said, “and I think: Oh, there! There!”

Her facility with a wide range of musical styles can be traced to a diverse musical education. She started piano lessons at age 6 with a teacher, she said, who let her play any musical style. “He did not judge anything, and that was really the lesson,” she said. After a rebellious break from music during her teen years, and a brief flirtation with pre-med classes, she studied music at Barnard College and soon got work as a Broadway pit pianist and freelance music director.

Most formative, though, was her partnership with Buryl Red, a Baptist choral arranger with whom she ran a music company for 25 years until his death in 2013. Assisting Red on countless recording sessions in Nashville, Tennessee, and around the world, she absorbed a range of musical influences, in particular gospel, that have served her well in such scores as “Violet” and “Caroline, or Change.”

This broad palette isn’t mere versatility for its own sake. Her colleagues talk about her rigor at winnowing their material, while her peers praise the results. Composer Stephen Schwartz hailed “her ability to always sound like Jeanine and yet to write very specifically for whatever character or milieu that she’s doing,” while Miranda said that she “serves character absolutely and rigorously.”

Said LaChiusa: “I never hear the composer screaming, ‘Look at me!’ Instead, I hear, ‘Listen to these words,’ and ‘Feel this character’s joy, this character’s sorrow.’ ”

Honing in on character may get closer to the heart of the matter. By comparison, Tesori recalled of a famous collaborator on the 2006 Shakespeare in the Park production of “Mother Courage,” for which she wrote music. “Meryl Streep disappears into her characters,” she said. “You sort of know that she’s there, but also you don’t. I like doing that too: I want them to be musicalized, not me. I feel like my job is to get out of the way of how they sing.”

In the case of “Kimberly Akimbo,” Tesori gives the title character — a teenager with a disease that ages her prematurely — bittersweetly introspective songs, while the callow teenagers and needy adults around her sing in a range of prickly, searching pop and rock. And in the quasi-operatic “Caroline, or Change,” she breathes life not only into the Black and Jewish characters but also into several inanimate objects, from a beatific moon to an angry, mournful city bus.

Tesori knows how to translate feeling into song so well that she was even brought in as a vocal producer on the new “West Side Story,” at screenwriter Kushner’s recommendation. She coached performers on the Bernstein-Sondheim songs, which they recorded in a studio before a frame was shot, and she followed up on set to make sure they maintained consistency.

“I love the treasure map of looking into a score as if you’re singing it into being,” she said of the film, though she could also have been describing the kind of information she encodes in her own work. “So you’re not singing ‘West Side Story,’ you’re actually expressing something a character needs in that moment. The tritone in ‘Maria’ is part of an expression, not a famous motif.”

Searching for a pre-verbal language to express big feelings, especially unexpressed ones among family members, may be how her musical antennae were formed. Gesturing to the family struggles at the center of “Fun Home,” “Caroline” and now “Kimberly Akimbo,” Tesori said, “I love a household — the counterpoint of the attic, the living room, and the basement.” Growing up as one of four girls in a Sicilian American family on Long Island, she recalled, “There was beauty to it, and there was great chaos to it, and they were all happening at the same time, depending on which fader was up.”

She remains tied to her Long Island roots, and photographs of her grandparents are prominently displayed in her office. Her grandmother’s ageless quality, she said, informed her work on the lead character of “Kimberly Akimbo,” while her immigrant grandfather’s thwarted career as a band composer and arranger — he had to pump gas to make ends meet — is part of what fuels the “urgency” she feels about making music.

Though Tesori doesn’t typically originate projects, she is careful in choosing them. When David Henry Hwang pitched her the idea of “Soft Power” — a reverse “King and I,” in which a Chinese diplomat becomes an adviser to an American politician — she said she immediately knew: “This is so ambitious and worth failing at, worth spending the four or five years they all take, no matter what.”

Hwang said she dug with complete commitment into both the show’s irony and its sincerity, and above all she “forced me to take my character seriously, and face my own trauma.” (Hwang was stabbed on a Brooklyn street in 2015 in what was possibly an anti-Asian hate crime.) The show, originally produced in Los Angeles in 2016 and at the Public Theater in 2018, is still aiming for Broadway.

With Tazewell Thompson, she wrote the opera “Blue,” about the police killing of a young Black man, which premiered at the Glimmerglass Festival in the summer of 2019. Planned for 2020 stagings scotched by COVID, the opera has new 2022 dates at companies in Seattle, Pittsburgh and Toledo, Ohio, with more commitments to follow. Thompson joined Tesori’s other collaborators in marveling at her ability to make music speak emotionally.

“It comes completely from her being in touch with the world, having her ears and eyes always open, watching, peering, getting involved,” Thompson said.

That kind of openness can be draining, she said, citing the Sondheim song “Finishing the Hat” for the way her mind will tend to wander to her work. “I feel like I’m always chasing music; I think about it almost all the time,” she said with a note of desperation.

While she maintains strong relationships — not only with her colleagues but also with her 24-year-old daughter, Siena, whom she co-parented with her ex-husband, musical director Michael Rafter — she admitted she struggles with work-life balance and thinks about retiring all the time.

“I find it a really hard life,” she admitted. “The loneliness of writing is very difficult. When students say, ‘I want to write for the theater,’ there’s a part of me that thinks, ‘Run!’ And there’s a part of me that thinks, ‘Stay.’”

Making music has been a craft Jeanine Tesori has learned, clearly, but hearing the world as music may just be how she is wired.

“Someone came to ‘Kimberly,’ this incredible woman, and she said, ‘Oh, I thought it was WON-dah-ful, it’s bee-YOO-tee-ful,’” Tesori said. The compliment was nice, sure, but “all I could hear was timbre of her voice. I started notating it in my head.”

This article originally appeared in The New York Times.