Inspired by Nick Didkovsky’s “Density Trajectory Study II For solo guitar and computer” I’ve recently been spurned into getting hold of a few alligator clips for the purposes of preparing guitar strings. Placed on modal points of the strings, they exchange the simple harmonics of an unprepared string for beautiful and complex gamelan-like timbres.
Here is a recording of some (sketchy) improvisation, playing a thus-prepared guitar laid on a desk with a pair of pencils.