Hayes Theatre Co, Sydney, July 6

I’m sure the good folk at Charlie Hebdo magazine won’t mind when I say, after seeing You’re a Good Man, Charlie Brown at the Hayes last night, that je suis Charlie. I must also say that je suis Lucy, or at least the better bits of her (I hope). But really we all are Charlie, as cartoonist Charles M. Schultz understood. Somewhere still within us is the four-year-old that Charlie was when he first appeared, and the five, six, seven and eight-year-old he became. The klutzy kid’s hopes and fears earn our laughter because we know them intimately. We undoubtedly still feel those things, except now we know enough to hide them. We make ourselves opaque; Charlie innocently lays it all out there. As a friend said last night, the emotion is unedited.

The musical – well, more a collection of gags and aphorisms, some of which are put to music – started life Off-Broadway in 1967 (with Clark Gesner’s book, music and lyrics), and was a big success. On Broadway it wasn’t. This is a delicate comedy not suited to the Great White Way’s need for red meat.

Shaun Rennie’s production, delivered by the excellent Georgia Hopkins (set and costumes), Hugh Hamilton (lights), Tim Hope (AV design) and Jed Silver (sound design), beautifully preserves the essential fragility of You’re a Good Man, Charlie Brown. There is no set to speak of, just a set of side drops on which colours wash. Snoopy gets his red dog house, Lucy her doctor’s stall. Schroeder his piano and Linus his blanket (how not?) but otherwise everything is kept nice and simple as befits a show in which the big production numbers are about Linus’s security blanket and Schroeder’s passion for Beethoven. Michael Tyack’s musical direction could not be more sympathetic to this jaunty, uplifting music.

Rennie’s cast is sweet, funny and heart-meltingly vulnerable – yes, even Sheridan Harbridge’s Lucy as she carries out a survey to ascertain her level of crabbiness while hoping to get a tick for her ability to “sparkle in company”. Nat Jobe’s Schroeder, Ben Gerrard’s Linus and Laura Murphy’s Sally each has a welcome turn in the spotlight and all praise to choreographer Andy Dexterity, not only for his splendid dances but for stepping late into the role of Snoopy and making him quite the sophisticate. Snoopy’s Red Baron number gives Dexterity a chance to channel Bob Fosse very amusingly so it feels a bit curmudgeonly (Lucy-like?) to say it’s the show’s most dispensable song. Despite the many joys of this production You’re a Good Man Charlie Brown is just a bit too long for its material and could very usefully be a slightly slimmer one-act piece.

Don’t let that caveat put you off though because then you’d miss Mike Whalley’s Charlie – the gorgeous beating heart of the piece. Whalley somehow manages to turn his tall, grown-up self into the very essence of a lovely little boy who knows there are lots of things he’s not good at but keeps on trying anyway. In his own way he is as indomitable as Lucy – more self-aware, certainly – and the pluckiest of troupers. It would be a very hard heart that did not love him, and this production, to bits.

You’re a Good Man, Charlie Brown, runs until July 30.