Popcast: Eminem and Lady Gaga Aim to Reclaim Their Relevance This week: pop's multiple-personality acts. Last week Eminem released "The Marshall Mathers LP 2," his eighth album, and Lady Gaga released "Artpop," her third. They're coming out swinging, fighting almost recklessly to keep or regain their space in the culture. Both albums are spilling over in content, highly variable in quality, and both play with ideas of multiple personalities. This is Eminem's stock-in-trade - the Marshall Mathers/Slim Shady/Eminem triad - but here he's doing it with even more effort, playing a walking disaster who never learns from his mistakes, proudly indulging in out-of-date cultural references and also rapping with possibly more speed and dexterity than he's ever done on record. On "Artpop," Lady Gaga sets up what she has described as "an exchange between two artists, one from the sphere of pop, the other of art"; she's turning toward visual artists for her forthcoming collaborations. But she's also making trend-conscious dance tracks about familiar topics: fashion, sex, drugs, and stardom. Jon Pareles, who writes about Lady Gaga in this week's Arts and Leisure section, breaks it down with host Ben Ratliff. Jon Pareles on Lady Gaga's "Artpop" Jon Caramanica on Eminem's "The Marshall Mathers LP 2″ Spotify users can also find it.