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Which European regions are known for singing in parallel thirds?

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folk music American folk-blues singer, songwriter, and guitarist Lead Belly.

While singing in parallel thirds—the practice of performing the same melody at an interval of a third—is found throughout Europe, it is particularly characteristic of the following regions:

Spain1
Italy1
German-speaking countries1
Western Slavic countries1

This technique is a common form of folk polyphony, which involves the simultaneous performance of multiple melodic lines.1