WHen jaime aff and christine langner are the performers what is the subject?
CREATE TABLE "table1_191105_3" (
  "episode_title" text,
  "subject" text,
  "music_by" text,
  "performed_by" text,
  "first_aired" real
);
SELECT "subject" FROM "table1_191105_3" WHERE "performed_by"='Jaime Aff and Christine Langner';