"Green Bus" is the album's lead single. When asked about the song's inspiration, Karen told Songfacts
: "I always like color words. They seem to have an ability all on their own to make a visual world, especially the word green. The feeling of the song is a longing to give something of worth, and searching for that thing. And the bus may have come about because of the guitar rhythm I was playing, which maybe has a circular motion, but also just from the idea of a quiet place to view the city from and to think one's thoughts and decide where to go next."