The most refreshing thing about "Max & Ruby," the musical adaptation of the popular children's books and subsequent Nick Jr. cartoon, is that the characters are allowed to be innocent.

The most refreshing thing about “Max & Ruby,” the musical adaptation of the popular children’s books and subsequent Nick Jr. cartoon, is that the characters are allowed to be innocent. Parents who have seen the trailer for the upcoming “Alvin and the Chipmunks” movie — in which Simon ogles a housekeeper and Alvin eats a ball of his brother’s waste matter — may be grateful that bunny siblings Max and Ruby are mostly worried about showing their grandma they love her. As an added bonus, this gentle, 45-minute tuner is also pretty good.

Presenter TheaterWorksUSA always hires seasoned writers, and this time it has commissioned a book from Glen Berger (“Underneath the Lintel”) and music and lyrics from Carol Hall (“The Best Little Whorehouse in Texas”). Both do strong work.

Berger’s script shows great respect for the kindergarten crowd. The characters are mostly under 8, but they live in a world where their ideas are taken seriously.

For instance, when 7-year-old Ruby (Kelly Felthous) decides to write and produce a play for her grandmother (Nancy Slusser), the whole town hears about it and gets excited. Hence, young imaginations are encouraged. And though 3-year-old Max (Lee Markham) can’t stay focused on rehearsal, his wandering mind is an asset. Reveries about glow-in-the-dark eels and giant tarantulas evolve into musical numbers, proving that fantasy makes playtime more fun.

Throughout, Hall’s music is catchy enough to grab little ears. “Bunny Scout Anthem,” a legit-style ode to Ruby’s community service club, features lovely harmonies, and “Cowboy,” which stages Max’s romp with a lobster, is a spot-on homage to prairie music.

Designers are equally creative. Louisa Thompson’s pastel set bursts with hidden doors and fold-out walls, and costumer Junghyun Georgia Lee suggests both tyke clothes and animal parts without overselling either. (Her wittiest touch is the grown-up neighbor whose “baby” is a human doll with rabbit ears on its head.)

Honoring the tone of the writing, director Randy White lets the show be for children instead of their parents. Scenes are directed with patient pacing, so that ideas have a chance to sink in. There are no sarcastic in-jokes or apologetic winks to the adults in the house — just a single, direct narrative that is methodically portrayed.

The relaxed tempo has rewards. When Max has a nightmare about a giant blue tarantula, icky spider legs start sliding around his bedroom doorframe. The creature is funnier because it emerges so slowly, accompanied by a cool jazz beat.

Yet for all these positives, the conclusion is worrisome. Beneath the obvious message that children should cooperate, the show also suggests Ruby is wrong to think about the play she wants to write. Max’s mindless, unchecked impulses drive the final moments, and we’re asked to see his behavior as preferable to his sister’s “bossiness.” One almost expects Grandma to say, “Boys will be boys, and isn’t that grand?”

It seems like kids get enough encouragement not to think too hard, or to accept that boys get more behavioral leeway. Do their furry friends need to remind them?

Max & Ruby

Lucille Lortel Theater; 299 seats; $25 top

Production

A TheaterWorksUSA presentation of a musical in one act with music and lyrics by Carol Hall, book by Glen Berger, adapted from the characters created by Rosemary Wells. Directed by Randy White. Music direction, Jana Zielonka. Choreography, Tracy Bersley.

Crew

Sets, Louisa Thompson; costumes, Junghyun Georgia Lee; lighting, Tyler Micoleau; sound, Eric Shim; orchestrations, Dave Hab; production stage manager, Jeff Davolt. Opened Dec. 9, 2007. Reviewed Dec. 8. Running time: 45 MIN.

With

Ruby - Kelly Felthous Max - Lee Markham Louise, Glow-in-the-Dark Eel - Karla Mosley Valerie, Sally-Swims-a-Lot - Amelia Morgan-Rothschild Gracie, Alien Green Gorilla - Jonathan Monk Grandma, Lobster Balladeer - Nancy Slusser
Musical Numbers: "Looking for Max," "Bunny Scout Anthem," "Cowboy," "Treasure," "Teeny Weeny," "Blue Tarantula," "Happily Ever, Then What?," "The Story," "Finale."

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