See https://github.com/adafruit/Adafruit_Learning_System_Guides/tree/master/Tiny_Music_Visualizer for the current code
See the license terms for code in each code directory (they are separate)
Tiny Arduino music visualizer!
A great demo of the Adafruit Microphone Amp and our Bi-Color LED backpack.
--> Bicolor LED Square Pixel Matrix with I2C Backpack
--> Electret Microphone Amplifier
Learn more about this project at http://learn.adafruit.com/piccolo