Geared to the 7-and-under set, this good-natured interactive musical exudes appeal beyond its demographic. Inspired by a German folktale, writers Lloyd Schwartz and Hope Juber’s adaptation features a good fairy named Hyacinth (Mary Garripoli) as the prime mover of events. After she welcomes the audience with a song about the importance of “doin’ good,” along comes a prince (understudy Iain Gray) who sings about “lookin’ good.” His attitude so annoys Hyacinth that she turns him into a frog, stipulating that he can only return to his natural form if kissed by a princess. The rest of the story proceeds along more or less traditional lines: The frog recovers the lost ball of a querulous princess (Jenn Wiles) who is reluctant to keep her promise to kiss him until pressured by her father, the king (Anthony Gruppuso). Much of the piece’s charm stems from the delight — and the unintended comedic faux pas — displayed by the youngsters called up on the stage to participate. The non-patronizing performers seem to be enjoying themselves as well. A song “Croak Croak, Ribbit, Ribbit” involving a couple of frog puppets is contagiously entertaining, whatever one’s age. The uncredited costumes are fun too. Barbara Mallory Schwartz directs, with songs by Hope Jube and musical director Laurence Juber.

Saturdays, 1 p.m. Starts: Sept. 26. Continues through Feb. 27, 2009

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