How can i get my car speakers to flash a blue light when the bass hits?

[o Werty o]

I have no idea how to do this. When the bass hits it my car, I want my car speakers to be able to flash a neon blue every hit. How can this be done? What should I buy and how should i use it? I already have blue neon lights in my floorboards and I want to add some flare to my car. PLZ HELP