The best music makes you feel lots of conflicting emotions. Charli XCX said “Boom Clap” is about something beautiful, and yet it still has a sad undercurrent. The singer also revealed what it was like ...

While “Boom Clap” appeared in The Fault in Our Stars, but it wasn’t intended for that film initially. Charli XCX tried to sell the song to former Disney star Hilary Duff before singing it herself.

The best movies made expressive use of music. For example, Charli XCX’s “Boom Clap” was perfectly used in The Fault in Our Stars, the film adaptation of John Green’s novel of the same name. This ...