“Before the fever” (originally stylised as B4 the Fever) is the ninth track on Grimes' fifth studio album Miss Anthropocene.

In the song, Grimes sings in her lower registers over a deep bassline and slow moving electric guitars. Indeed, “Before the fever” is one of the slowest and darkest sounding tracks on the album. This slower sound parallels with the album opener “So Heavy I Fell Through The Earth” and starkly contrasts with much brighter, sweeter next track “IDORU.”