Katie Melua explained to Metro France the background to this song: "Actually, I wrote that song with Molly McQueen and we wrote it for her, because I'm trying to write for other artists. But unfortunately, her album didn't work out so we ended up putting it on my album. But yeah, we actually wrote it for her acne 'cos she always scratches herself. She's addicted to it! So to me, 'Perfect Circle' is kind of about an addiction, and that addiction could be about biting your nails, drugs or being obsessed with a TV program. When you try to straighten out and change your habits, you still always seem to go back to it."
The Prince-penned "Manic Monday" was the first song The Bangles heard coming from a car radio, but "Eternal Flame" is closest to Susanna's heart, perhaps because she sang it in "various states of undress."