...is literally microscopic.


http://www.news.cornell.edu/releases/july97/guitar.ltb.html

TAKEN FROM ARTICLE:
...(the guitar) has been made at Cornell University to demonstrate a new technology that could have a variety of uses in fiber optics, displays, sensors and electronics.

The guitar has six strings, each string about 50 nanometers wide, the width of about 100 atoms. If plucked -- by an atomic force microscope, for example -- the strings would resonate, but at inaudible frequencies. The entire structure is about 10 micrometers long, about the size of a single cell.