There is not one single way to build out your hardware solution for use with LightShow Pi. LightShow Pi handles all the software for synchronizing your lights to music using the GPIO (and expansion cards via SPI or I2C) of your Raspberry Pi, but it’s up to you to build out your hardware solution to take advantage of this software. That said, there are many resources available to guide you in your hardware build. Here are some to get you started:
Here is a link to the blog-post that I got started from before creating LightShow Pi. It is a great resource for getting your initial hardware setup as well: http://chivalrytimberz.wordpress.com/2012/12/03/pi-lights/
Here are also some wiring diagrams for the Raspberry Pi to help get you started: Wiring Diagrams
You can also check out various hardware designs and share your own in our Google+ Community.
Feel free to comment below if you have links / ideas for other hardware designs!