Episode: "Negro y Azul" (Season 2, Episode 7)
In what is for sure the boldest (and strangest) Breaking Bad opening ever, Los Cuates de Sinaloa perform a narcocorrido (Spanish for "drug ballad") about Heisenberg. As this is a Mexican folk music sub-genre, and the performers of this particular number are Mexican, the song is sung from the perspective of the cartel. "But that homie's dead / He just doesn't know it yet," goes the hook of "Negro y Azul" (Spanish for "Black and Blue").
The dead homie is Heisenberg, that frustrating gringo. Breaking Bad is plenty careful with its foreshadowing (see: All of the black-and-white openers to the second season and the plane crash)—maybe this song has something to say about how the series will end? —RS