The granddaddy of dark, decadent musicals, The Threepenny Opera still packs a punch with its biting social commentary that has remained relevant through the ages. The current production being staged by New Line Theatre is fresh, vital and deliciously subversive, underscoring author Bertolt Brecht’s sly observations that crime does indeed pay, whether for a rogue like Macheath or for the pillars of a society that diminishes the humanity of the less fortunate.