See the video by clicking the title:
Engineering Students Rock -- Mechanical Engineers Rock Out On Guitars They Construct Themselves:
January 1, 2009 — Mechanical engineers combined their skills with that of electrical engineering and computer science to create a college class inspired by the Guitar Hero game. The hands-on course requires students to build their own guitar. To do this, students choose a shape for the guitar, which is cut out of lumber by a computer. Located under the guitar strings, magnets detect vibrations and wire coils send an electronic signal to an amplifier and speaker. Effects pedals can also distort the sound and add special effects."
The video at clicking the title: