This project is taking a tip 31 transistor and hooking it up to a led light so that when plugged in will light up to the music that is playing. You'll need a audio spitter that you plug the light in one of the female ports and you audio source into the other female audio port. Then the male audio port you plug into your ipod or whatever device you use to play you music.
2 in one out audio jack
male end audio jack with wire