Turn on visual effects in Music on Mac
Use the visualizer to watch colorful light shows. You can use the visualizer with or without music; the effects change based on the type of music and whether it’s playing or paused.
In the Music app on your Mac, do one of the following:
Turn on visual effects: Choose Window > Visualizer.
Tip: To show or hide a list of commands you can use to control the visualizer, press the Question Mark key (?) on your keyboard while the visualizer is on.
Turn off visual effects: Choose Window > Visualizer (to remove the checkmark), or press the Esc key.