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There are actually quite a few makers out there using all kinds of composites and a few using aluminum (and the history of all of these materials can be traced back to various guitars, mainly bass necks, in the '70s). Many of these represent the potential for pretty amazing, and very even tone. Though there will probably always be some debate if only because we've grown accustomed to what may be less perfect tone.
Rainsong guitars are some pretty amazing acoustics made of carbon fibre, and Alumsonic is a great check point for an aluminum guitar. For more historic and mainstream example, the old Kramer bases with the aluminum necks, or anything made by Steinberger (materials aside, his Transtrem and tuners also deserve some major mention for their designs).
I think Ken Parker's designs deserve special note as well with the use of composite materials to reinforce wood, which allows for very light bodies using some tone woods which would otherwise be too light and lacking in strength to perform (his original designs largely used ebony for reinforcement, but as designs moved towards production things became much more space aged).
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