It’s not often that one gets to witness a world premiere musical in the making.

“The Apple Boys,” Bucks County Playhouse, New Hope, is in the tradition of the Straw Hat Circuit going back to the 1930s when it used to wend its way from the Poconos to the Cape and beyond.

“The Apple Boys,” which takes place on Coney Island at the turn of the 20th Century, had its initial world premiere off-Broadway in 2018. Soon after, you and the world know what happened next: the pandemic.

“The Apple Boys” at Bucks Playhouse is “a new production designed to fill a much larger theatre to prepare for a transfer to New York,” according to the producers’ notes in the show’s program.

“The Apple Boys” fills the Bucks Playhouse and then some with a brash, flamboyant musical that has some of the best singing, dancing and cavorting ever to grace the storied New Hope stage. The May 3 performance was seen for this review.

Speaking of stories, the story of “The Apple Boys” is about none other than the grandson of Johnny Appleseed, as in Jack (Jelani Remy). It seems the family orchard is, pun intended, going to seed.

Jack, as in Jack Chapman (Appleseed’s real name was John Chapman), puts together a Barbershop Quartet to compete in a singing contest, win the top monetary prize and save the farm. Hey, guys, let’s put on a four-part harmony.

Jack teams with Nathan (Teddy Yudain), as in Nathan Handwerker, founder of Nathan’s Famous that began as a stand on Coney Island, and with two other, ahem, hot dogs: Warren (John Breckenridge), as in Warren Lincoln Travis, a strongman who performed derring-do at Coney Island, and Hank (Emily Skeggs), as in Lina “Hank” Beecher, inventor of the first looping roller coaster, the Flip Flap Railway at Sea Lion Park, Coney Island, and later known as the Loop the Loop.

This was no Lawrence Ferlinghetti, “Coney Island of the Mind.” These were real personages (with the exception, um, apparently, of Jack because it’s said that Johnny Appleseed, ironically, didn’t cede, so to speak, any descendants).

“The Apple Boys” has music and lyrics by Ben Bonnema and book by Jonothon Lyons. The Bucks show is directed by David Alpert and choreographed by Marc Kimelman, with music supervision by Rona Siddiqui.

Scenic design by Adam Koch, lighting design by Rui Rita, sound design by Beth Lake and costume design by Johanna Pan recreate the Coney Island milieu so effectively you’ll want to step right up.

The respective character’s myths are told in song: “The Legend of Johnny Appleseed,” “My Own Two Hands,” “Bumpity Bump” (an incredibly inventive piece that takes the audience along for the ride) and the title song, “The Apple Boys.” Pianist Sujin Kim-Ramsey, the show’s music director, adds her own flair.

The four actors, in addition to having wonderfully powerful voices, display a spontaneity in athletic prowess and incredible versatility as they take on additional roles, more than two dozen characters, throughout the fast-paced show. When they finally put on the straw hats, “The Apple Boys” explodes with merriment. It’s polished fun.

“The Apple Boys” brings to the stage a bygone era fascinating not only for its harmonic resonance but for the veracity of its story. It’s a musical of exhuberence, naïveté and charm performed by four actors and a piano player whose fireworks light up the Coney Island sky and, in the Bucks Playhouse production, the New Hope sky. The Straw Hat Circuit lives again.

“The Apple Boys,” 7:30 p.m. May 23; 1:30 p.m., 7:30 p.m. May 24; 1:30 p.m. May 25, Bucks County Playhouse, 70 S. Main St., New Hope. 215-862-2121, https://bcptheater.org/