Xenharmonic is fairly recent broad musical term used to refer to tuning systems or music using those systems not using the common twelve-tone equal temperament. It is also used more generally to refer to all microtonal music. The term was invented by Ivor Darreg from the Greek for strange or foreign, xenos. Xenharmonic tunings include non twelve tone equal temperament, such as, say, nineteen tone equal temperament, some tunings based on the 'music of the spheres', or less systematic tunings such as Annie Gosfield's purposefully "out of tune" sampler based music. Other composers of xenharmonic music include Elodie Lauten, Wendy Carlos, and many others.
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