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Some of the sweetest beats in Manhattan on Friday will come from the brass and strings of 24 young musicians who’ve roamed far from their hardscrabble Florida town to lay it down at the country’s most prestigious high school jazz competition.

The jazz band from the Osceola County School of the Arts –- a 900-student school located in a financially frayed community on the fringe of Disney World –- already has bested nearly 100 other high school ensembles by landing an invite to compete against 14 other groups at the annual “Essentially Ellington” contest at Jazz at Lincoln Center.

Osceola, a 6-12-grade arts school that enrolls students through auditions, represents the rugged realities of its community. In Osceola County, the per capita income is $19,728 and 16 percent of the locals live below the poverty level, according to the U.S. Census Bureau.

Three student-musicians at the school are homeless.

Junior Rhys Snell, center, plays a solo on his saxaphone while practicing with the jazz band at the Osceola County School for the Arts in Kissimmee, Fla. a few weeks before they compete in Essentially Ellington, an annual HS jazz band showdown May 8-10 at Lincoln Center in New York City. The competition is considered the Super Bowl for prep jazz musicians.Jim Seida / NBC News

The band’s director, Miguel Alvarado, has tuned up a secret game plan for their set Friday.

“I don’t want to give away too much. My school is a little over 60 percent Latino so we’re definitely going to bring that Tito Puente sound,” Alvarado said. “That’s what I grew up with. And my kids, that’s what they grew up with.”

And there’s one more soaring note to this score: Osceola had never before even submitted a tape for consideration. Their big moment carries an underdog charm –- it’s like “Hoosiers” with horns instead of high-tops –- but these teens are playing to win.

"My school is a little over 60 percent Latino, so we’re definitely going to bring that Tito Puente sound."

“It's great to see a set of kids come together for a common goal in today’s modern age, when so much of what we focus on in America has to do with the individual,” said Victor Goines, a saxophonist and clarinetist in the Jazz at Lincoln Center Orchestra. He’s serving as Osceola’s assigned mentor at the musical throw-down. He recently visited their Kissimmee campus to give them a listen and some advice.

“For so many kids today, team activities like baseball, basketball, and band seem to be almost archaic. But they’re the fabric of helping us be better people inside our society. So seeing this is very inspiring,” Goines said. “It kind of makes you realize why you do what you do.”

Osceola County School for the Arts music teacher Miguel Alvarado instructs senior Kiara Gonzalez on the piano.Jim Seida / NBC News

Each band gets a 20-minute window to perform a repertoire of hits made famous by jazz legend Duke Ellington, playing before a panel of elite judges that includes Wynton Marsalis, trumpeter, composer and artistic director of Jazz at Lincoln Center. The winners will be announced Saturday night.

These days, jazz seems like a rarefied art form, but many of the sound’s greatest practitioners, from Louis Armstrong to Charles Mingus, came from rough and tumble backgrounds.

Alvarado, who started open-mic sessions at a Kissimmee pizza joint, knows that well.

“For the students, they have to figure out: how do I fit into this music?"

“It's all about the creativity, man,” Alvarado said. “Like, one second the kids will be playing something real funky then all of the sudden organically it switches to swing and then to something Latin. Just a bunch of kids from a bunch of schools. They have some freedom, and it becomes a community thing. They start to talk more online, listen to music together online, with the main engine being jazz.”

That sensibility strikes a personal chord with Goines, who says Ellington’s music was and is about “the continual conversation between the instruments.” Through solos, many of Ellington’s players back in the day became stars -– Johnny Hodges, Cootie Williams, and Cat Anderson among others.

But Ellington kept those “heavy personalities” in check to create a complexly textured sound that’s never been articulated by any other ensemble, Goines said. He adores the notion that modern musicians might latch onto to Duke’s jazz-fueled life lesson.

Victor Goines, member of the Jazz at Lincoln Center Orchestra (right), talks with senior Ryan Bishop at the Osceola County School for the Arts.Jim Seida / NBC News

“For the students, they have to figure out: how do I fit into this music? To just play Ellington is good. But the more you start to play it, the more you start to figure out who you are with respect to the music. That’s what it’s taught me over the years,” Goines said. “It’s been thought provoking: Who am I, and how can I fit in?”

While in Kissimmee, Goines was quietly approached by the band’s baritone sax player, Ryan Bishop. During a performance of Ellington’s “I Like the Sunrise,” Bishop, 18, wailed on a solo, trying to mimic Ellington’s baritone sax great, Harry Carney.

“Jazz is about the experiences that help us become what we ultimately want to be."

“Am I getting there?” Bishop asked Goines, referring to Carney’s resonance and power.

“You are starting to get there,” Goines told him.

“It was this huge relief but also huge praise,” Bishop said later. “Some people don’t have a chance in their whole lives to talk to someone with a group that big and bad.”

Bishop, too, comes from a financially stressed home –- a home now in foreclosure. A bank is allowing his mother and Bishop to stay there until the property is sold at auction. After that, they will move to an aunt’s house.

Goines definitely heard the familiar notes but said he also saw a palpable hunger for music in Bishop, who intends to continue his sax playing in college.

“I hear Harry coming out in him already. But I want him to know something else: What we do is not about where we arrive at, it is about the journey we take to get there,” Goines said. “Jazz is about the experiences that help us become what we ultimately want to be."

“The journey he’s taking is a great one.”