Pulsing LED's to music using electet mic.

Not sure how exactly to do this. I am hoping I can do it without amplification of some kind. So any advice is helpful. Basically I have an array of led's that I want to pulse to external sounds picked up by a microphone.

You will have to amplify mic signal, at least.
http://fftarduino.blogspot.com/2011/02/color-organ-spectrum-analyzer-on.html