Capital Cities sing here of the inability of words to describe their emotions.There's a freight train of emotion stuck in my lung
I need to get it out, get it out before it's all gone
So I'll just speak in vowels from now on
Capital Cities' Sebu Simonian
said of the song, "When you can't express yourself with words, sometimes you just want to scream to get it all out. You need vowels to do that!"