1980s rap drama 'Roxanne Roxanne' crackles with power of sisterhood

Non-aficionados won’t know the name Roxanne Shanté, and even among fans she might have receded to the realm of pop-culture footnote. But the Queens hip-hop prodigy’s story grabs the mic in “Roxanne Roxanne,” a film that breaks the musical biopic mold in ways that are sometimes frustrating and frequently...