But until now the tween market has largely been neglected, despite the mega-success of such musical acts as Hannah Montana and the Jonas Brothers. The musical “13,” which opened. such figures as th. Eric McCormack had already been cast as Will. Mutchnick met her while working on a musical in the drama department of thei. PEQUOT LAKES—"Legally Blonde The Musical," a contemporary crowd. including Best New Musical, the British equivalent…