Hollywood, rock and roll and reality TV are all subject to artist Jeremy Blake’s critical eye in Wild Choir: Portraits by Jeremy Blake. The Corcoran Gallery of Art, where the show opens tomorrow, calls his work “psychological pop portraits” — trippy digital videos depicting the lives of cultural figures. Flashing images, voice overs, music and explosions of color are typical in the three videos on display — 2003’s Reading Ossie Clark, 2005’s Sodium Fox, and…