Turn on visual effects
Use the iTunes visualizer to watch colorful light shows. You can use the visualizer with or without music; the effects change based on the music playing.
If you use the visualizer with a playlist that includes music videos, the visualizer shows the videos by default. You can change this setting.
Turn on visual effects
Choose View > Show Visualizer.
To change options, choose View > Visualizer > Option.
Set the visualizer to show or hide music videos
Choose View > Visualizer > Play Videos. A checkmark means videos will be shown.
To show or hide a list of commands you can use to control the visualizer, press the ? key on your keyboard while the visualizer is on.
To turn visual effects off, choose View > Hide Visualizer or press the Esc key.