light and sound machine

Hoping to use a arduino in a light and sound machine. The only difference between my thoughts and other projects on net is I want to use a external audio source and have the auduino react to the audio source (maybe using MSGEQ7). Just wondering if anyone has any other ideas or if this idea is worth trying to see if it would work well?

or if this idea is worth trying to see if it would work well?

Other people have used the MSGEQ7 with an Arduino, successfully. You should be able to, too.

sorry had to correct things in my post damn smart phone.