Punctuated with beats by De La Soul and Slick Rick, and replete with an onstage D.J., the high school-aged performers of “Roxbury Strong” delivered a history lesson of their city’s sometimes besieged but unbowed residents. The stage is set up as multi-leveled platforms from which the actors delivered first person monologues in the character of a historic Roxbury persona, each representing a particular point in time. The name and photograph of each historic figure showed on a