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http://www.sparkfun.com/products/8635

I am looking into that item.

I want to build a circuit that takes input from outside audio, most likely my speakers, and then turns it into an RGB LED light show.
Different frequencies produce different colors and and different volumes produce brighter lights.

Can I buy and wire in just this once piece and have it work? Or does the signal need to be amplified before use?

Or should I just wire in the audio signal from my computer and skip the mic altogether? (I would just use a normal audio out jack and run the wiring into my system, which I have done for another project)

Thanks everyone!
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Or should I just wire in the audio signal from my computer and skip the mic altogether?
That's what I would do, use the circuit in this link to couple that into the arduino.

http://interface.khm.de/index.php/labor/experimente/arduino-realtime-audio-processing/
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I'm using this sensor for my Clapper project.

Wk
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I think WilliamK meant to include...

http://www.ebay.com/itm/Sound-Sensor-Module-Arduino-Sensor-Shield-MCU-PIC-/120758238742?pt=LH_DefaultDomain_0&hash=item1c1dc07e16

...in his post! A $5 Audio-to-analog interface module.
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Oops, indeed, thanks bud.  smiley-red

Wk
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Why is the example on Ebay for the $5 module only to measure sound energy level?
Can it also record the waveform?
Assuming a place to put the data...
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Why is the example on Ebay for the $5 module only to measure sound energy level?
Because the people who wrote it were rubbish at English.

It also says:-
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Based on a high sensible microphone and onboard Voltage regulator supply,
I much prefer stupid microphones myself.
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So it can be used to sample audio?  I have a simple FFT sketch that works with this circuit:
http://www.datasheetcatalog.org/datasheet/analogdevices/SSM2166S.pdf

The $5 Mic is an alternative?
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So it can be used to sample audio?
It looks like it but post the question to them on ebay. It could be that there is a peak envelope detector built in but unless it is in the chip I can't see any components that would do that.
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I agree.  Done.  Asked.
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