josh blog: "But I'm not shaken, Wittgenstein. Hearing a song in your head is kind of like singing it aloud - your memory of it can be different when doing it as opposed to just recalling it. Once you start singing, you can keep going. You can remember parts in the middle that you would otherwise be unable to. (I think it works the same way with the train departures too, but there the story is more complicated.)"