It was written and produced by Florence Welch, Emile Haynie and Thomas Bartlett.

[1] Sky Full of Song was inspired by Welch performing on stage.

According to Rolling Stone, Welch made a statement that “Sky Full of Song” came to her “fully formed.” She said, “Sometimes when you are performing you get so high, it’s hard to know how to come down.

[...] There is this feeling of being cracked open, rushing endlessly outwards and upwards, and wanting somebody to hold you still, bring you back to yourself.

It’s an incredible, celestial, but somehow lonely feeling.” [2] Credits adapted from the liner notes of High as Hope.