"She's Long Gone", by The Black Keys, is a song featured in the Person of Interest episodes “Masquerade” and “Liberty”.
The song was played at the end of “Masquerade” when it was revealed that Kara Stanton kept Mark Snow hostage in a basement. In “Liberty” it was played in a club where Jack Salazar and his fellow sailors went to party during fleet week.
"She's Long Gone" is the only song that has been used in more than one episode, and 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.
She was made to blow you away