Here is something I came across which you may be able to interface to the lighting.
http://www.instructables.com/id/Glow...anging-Guitar/
Ignore the bastardisation of the axe in the article - towards the end it details using an Arduino Micro to sense the sound and drive multi-colour lights.
I would suggest using a clone Pro Micro (about $6 on fleabay) instead - smaller, cheaper and the same microprocessor.
