This design is very extensible. Some additional ideas include: -Adding additional LEDs -Filtering out treble, bass, and band frequencies and blinking...
These instructions will help you learn how to construct an audio-reactive LED circuit. Familiarity with electronics and soldering is strongly recommended Barring any circuit errors, the task should take no more than an hour. This circuit can easily be expanded and integrated into other projects to create visually impressive effects.
Step 1: Safety Precautions
Caution should always be exercised when working with electric currents. Currents can cause burns or damage to vital organs. Currents as small as 10 mA can be damaging or even fatal. Power sources should be disconnected when modifying a circuit, and remember to always use common sense when working with electronics.