Build an Arduino Music Visualizer
If you yearn for the pixely music renderer days, look no further than this tutorial from Adafruit to create your own tiny spectrum renderer using Arduino.
To complete this project, you will need an Arduino, a microphone amplifier, an LED pixel array, and a few other details, but the end result is a visualizer that turns any sound into art. This is a simple and fun project that will teach you a lot in the end.
Arduino Miniature Music Visualizer | Adafrut