Lyric discussion by strayerfox 

Cover art for Sky Full of Song lyrics by Florence + the Machine

It is about her being in a literal sky full of songs, high above everyone and everything else, isolated from the crowd she is singing for. She feels both 'celestial' and lonely at the same time.

Sky Full of Song was inspired by Welch performing on stage. She opened up that she feels an otherworldly sense of being. However, at the same time she feels a sense of loneliness once she starts performing on stage. At times she doesn't know how to enjoy herself and so lets the song take over her being. According to the rollingstone magazine 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.”

Still, individual lines of the lyrics are up to interpretation I guess.

Song Meaning