45 is the second release from Bleachers' third album and also their second release of 2020, and their second release in two years and half since the Love, Simon soundtrack back in 2018.

It was released by surprise alongside with their Bruce Springsteen collaboration “chinatown”, the song was written by Jack Antonoff alone and it presents a folky sound deeply marked by the solely use of an acoustic guitar throughout the whole song.

The song is about Antonoff moving away from his home state, NJ, to further his career, while still keeping his roots in mind and remembering the impact that growing up in NJ had on him.