Intially I was working on my own version of Mad World and I did complete it however the Robot Cello didn't work out because the sound of the solenoinds and stepper motor was drowning out the song. So I scrapped the project altogether. One night I was working on the Cello and the stepper motor started to jitter almost ripping the Cello sting and Bow apart. As I was jumping over to the power switch I noticed that the jittery sound reminded me of a song. That song turned out to be The Beautiful People by Marilyn Manson. I programmed a small part for the Cello and it sounded great. Who would have ever though to use a Cello in that song? 2 months later.... my video was complete. So Enjoy. I may follow up with a another video showing what circuits, parts and tools that were used to make these robots. I would also like to thank jtodd900 for his YouTube video "The Beautiful People guitar cover WITH TABS". It was very helpful with respect to programming my Robot Guitar. Muting the strings was a bitch but if you look at the solenoids on Fret 4 and 8 you will see that I covered the pads with foam and velvet. It is soft enough to stop the strings from vibrating.