Change Black Macbook Pro screen to something cool when music is playing? When I am playing music on my Macbook Pro and don't touch the computer for a while, the screen goes black and the music is still playing. How do I change the black screen to something cool that goes with the music?
With iTunes in foreground, either press ⌘T or select View > Visualizer, choose the animation, and select View > Show Visualizer.

The visual effect will change with the music: enjoy!