This isn't really a live spectrum analyzer. I imported a song in After Effects and converted it to keyframes.

These keyframes could then be copy-pasted into Actionscript into one big array.

They way you use these numbers is all up to yourself ofcourse...

Song: Simpsons OST - Spiderpig

URL: http://www.mauricemelchers.nl/experiments/06_equalizer/spectrumHand.html

Date: 2007