My take on a 127 band audio spectrum analyzer using a PIC18F452 @ 40Mhz...
1x PIC18F452, 1x 10Mhz oscillator, 1x LM324 opamp, a few cap's and resistors, 1x graphic LCD, a handful of wires, a battery, done...
WARNING: Turn down the volume before playing!
Yes, absolutely crap video quality, but it's all I had at that time.