Excerpt from "Some Unusual Examples from the Backyards of Musical Instrument Acoustics" by Johannes Bergmark
"Like other contact mike-based musicians, I use tools, kitchen utensils, toys, sticks etc. Some of my colleagues are Adam Bohman, Martin Klapper, Eric Leonardson, William Davison and Tom Nunn, who uses combs cut into different shapes as tools on his Skatchboxes, which also integrate combs. Hopkin made an instrument where combs are tuned to a scale."
"Some Unusual Examples from the Backyards of Musical Instrument Acoustics" by Johannes Bergmark. Published in Soundplay, Laznia Centre for Contemporary Art, Poland, 2013