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In page Derek Bailey (guitarist):

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Throughout both his commercial and improvising careers, Bailey's principal guitar was a 1963 Gibson ES 175 model.[1] Although he occasionally made use of prepared guitar in the 1970s (he would, for example, put paper clips on the strings, wrap his instruments in chains, or add further strings to the guitar), often for Dadaist/theatrical effect,[citation needed] by the end of that decade he had, in his own words, "dumped" such methods.[2] Bailey argued that his approach to music-making was actually far more orthodox than that of performers such as Keith Rowe of the improvising collective AMM, who treats the guitar purely as a "sound source" rather than as a musical instrument. Instead, Bailey preferred to "look for whatever 'effects' I might need through technique".[2]