One is serious in its interest in social and political issues, like what Brecht and Weill were doing with their work that served
socially, politically
useful purposes, and the other is playful and humorous, which was insightfully brought up in Lynne Cooke's excellent catalogue essay for your show at the Stedelijk van Abbemuseum in the Netherlands [Allan McCollum: The Art of Duplicitous Ingemination, 1989]?