How awesome is this: CNN has created the "Dow Piano," which translates the peaks and valleys of the Dow Jones Industrial Average into the notes of a musical scale. Thus, just by listening, you can actually hear how the Dow did over the course of the year.
Created by CNN creative director Bård Edlund, the Dow Piano render's each day's closing level as a note, spanning three octaves. The higher the pitch, the higher the level was. Additionally, a higher audible volume maps to a higher trading volume. Thus, a panicky, furious trading day translates to a loud, low note; a loud, keening flourish is a good day; and more muted notes represent days when trading was sluggish.