The twelve-string guitar is an acoustic or electric guitar with 12 strings in 6 courses, which produces a richer, more ringing tone than a standard six-string guitar. Essentially, it is a type of guitar with a natural chorus effect due to the subtle differences in the frequencies produced by each of the two strings on each course.
Twelve-string guitars are made in both acoustic and electric forms. However, it is the acoustic type that is most common.
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