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In 1997 Derek Bailey received a letter asking if he had ever used preparations on the guitar and, specifically, for information on the 19 string guitar featured in a number of recordings from the early 1970s. His reply is below:
"In the late 60s/early 70s I occasionally used bulldog clips etc. attached to the strings - all standard preparations at the time. Later I adapted a guitar - an Epiphone - for these purposes. This was the '19 string' (approx) guitar. The guitar had an internal mike attached to the practice amp. Additionally there was a longish wire/string that kind of trailed behind to which might be attached all kinds of things (on the recording 'Domestic and public pieces' the instrument pops up here and there and on that particular concert there was an amplified thunder sheet attached to the long string). The whole thing was of course mobile. Toward the end of the seventies I dumped it, finding that I prefered to look for whatever 'effects' I might need through technique."