The direction of melody

Sometimes a song catches in your head, going back and forth and around and around, like a wheel attached to a giant pendulum. It can lift you up, high enough to bring on fear but lose it at the same time, or it can bring you down, low enough to ground your feet for a moment and rest from the dizziness of the world.  And sometimes it can leave you hovering in mid-air, giving you time to process everything up to that instant. That’s when you have the chance to choose: up, or down?