“Cosmic Love” has an ethereal yet somber sound, connoting a seemingly light-hearted approach to a melancholy subject. Welch told The Sunday Times that the song illustrates how being in love means “you give yourself up to the dark, to being blind.”

Florence also described about its creation on the band’s webpage:

“Cosmic Love” was a joke title, but it stuck. The most hungover I’ve ever been when writing a song. I went to [Isabella Summers’s] studio after having been to a party, and I was lying on the floor wanting to vomit. We were working really hard on a song and just trying to make this sh*t piano part work, and all of a sudden I hit on one note, and I’d got it. We wrote the whole song in ten minutes.