Watch out, Curious George; there’s a new rock-star monkey in town.This week, the Palo Alto Children’s Theatre is debuting a stage version of Cory Cullinan’s The Ballad of Phineas McBoof, the story of the titular Phineas, a monkey who’s achieved fame and fortune but lost his passion and creative drive along the way. He rediscovers his love of music with the help of his oddball new band. Judge Luckey, the theater’s artistic director, commissioned Cullinan to write the musical with the hope of fostering creativity in children and teaching them about the value of music.“The kids are between the ages of 8 and 15, and they’re really loving the music,” said Luckey just before one of the final rehearsals.