"I Know U Know"@en . . "\"I Know U Know\" is one of the few songs that is source music (sometimes called diegetic music). Unlike the episode's score, source music is heard by the characters in an episode and originates within the story itself."@en . . "I Know U Know"@en . . . . "\"I Know U Know\" is one of the few songs that is source music (sometimes called diegetic music). Unlike the episode's score, source music is heard by the characters in an episode and originates within the story itself."@en . .