Symbolism, Imagery, Allegory
The "Just Listen" CD is the last of the CDs that Owen gives to Annabel to inform her musical education. She gets through all of the CDs before landing on this one, and realizes that there's no music on it—it's just the sound of silence. At first she thinks it's odd, but she comes to find meaning in the silence on the CD:
It was the weirdest thing, so different from music. The sound was nothing, empty, but at the same time, it pushed everything else out, quieting me enough that I began to be able to make out something distant, hard to hear. But it was there, albeit softly, coming to me from some dark place I'd never seen but still knew well. (12.41)
For Annabel the CD represents how people can interpret an event or situation differently. The thing is, though, that the CD wasn't supposed to be empty; it was a mistake on Owen's part. But Annabel listened to it and found profound meaning anyway, which is a perfect example of the very message she understood the CD to be conveying.
When we look at the rest of the book, we can see other examples of how one situation can be given multiple interpretations. For instance, Annabel's rape is seen in so many different ways by the characters. Annabel sees it as a scar and a horrible secret; Sophie sees it as a betrayal by Annabel; and Owen sees it as a terrible event—but also as an opportunity for Annabel to do the right thing and make a difference.
The moral of the story? Well that depends on who you ask.