Most electronics hobbyist seems to be interested in projects involving Audio Spectrum Analyzer/Visualizer at some point in time. We have came up with an instructable to show how an Audio Spectrum Visualizer can be built using Bi-color LED Matrix and the MSGEQ7 IC chips.
For more detail about the project, you may visit our instructable at http://www.instructables.com/id/Arduino-based-Bi-color-LED-Matrix-Audio-Spectrum-V/
You may watch the following YouTube video to see the Spectrum Visualizer we built:
