'The Last of Us' episode 7: How Ellie's cassette tapes link back to the game

The Last of Us is quite the musical show. It's made us cry to Linda Ronstadt's "Long Long Time," jam out to Depeche Mode's "Never Let Me Down Again," and then cry again to that same Depeche Mode song. But episode 7, titled "Left Behind," might just be the show's most musical episode yet.

"Left Behind" gives us an in-depth look...