In music theory you can make nice sounds if you hit three notes at the same time. So long as they have some sort of mathematical sonic relationship - like the notes C-E-G. So three strings on a home made cigar box guitar all tuned to have a special combination of notes should work. Throw in a bit of metal tubing for a slide, a couple of piezo electric pick ups, a wah wah pedal and amp and you have some crazy noise potential (aka fun). The "surf" linoprint is for embellishment only, but creates the illusion that the noise is vaguely oceanic.