This is the lead single from 5 Seconds of Summer fourth album Calm
. The record title is an acronym of the first letters of the band members' names, C
uke and M
ichael. Luke Hemmings explained to HMV
: "With this album being a massive growth period for us and the band truly understanding the importance of the four individual artists in the band, we felt it was a fitting name once it came about. It's also a nod to our fans as they have been using the C A L M acronym for years."