This is a song from the "Prom Wrecker" episode of the American Nickelodeon sitcom Victorious, which aired on May 21, 2011. The series revolves around aspiring singer Tori Vega, portrayed by Victoria Justice, who attends a performing arts high school called Hollywood Arts, and this episode featured her throwing the Hollywood Arts prom.
The song finds Victoria singing about being irresistibly attracted to her BFF's brother. Cat (Ariana Grande) and André (Leon Thomas) accompany her in the televised episode but Victoria sings the official studio version on her own.
"The Night Chicago Died" was written and recorded by the British group Paper Lace. They talk about Al Capone in the song, but got a lot of details wrong - understandable since they wrote it based on gangster movies.