This "Drive Tray Guitar" was built by a workshop participant during our MIDI Scrapyard Challenge workshop held at Eyebeam in NYC last weekend. Basically it was built by integrating an old computer's CD drive into the body of an acoustic guitar and using the "Ejection" mechanism to create a "strumming" function that when moved back and forth connected up the "strings/wires" to produce sounds. Really nice use of an existing instrument mixed with some electronics detritus from the scrapyard!