LadyJean, that lie about "Drei groschen Oper" has been around for some time. And his name is Bertolt Brecht. Both he and Kurt Weill acknowledged a debt to Gay's Beggars Opera, but there nothing plagiaristic about their lyrics and music, except four songs adapted from a failed German version of "Villon." This also was acknowledged at the time. Although flawed and flippant, it remains an important influence on modern theatre and music, but it requires some knowledge of the 1920s to understand it.