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In page Shakers:

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Many of the lyrics to Shaker tunes consist of syllables and words from unknown tongues, the musical equivalent of glossolalia. It has been surmised that many of them were imitated from the sounds of Native American languages, as well as from the songs of African slaves, especially in the southernmost of the Shaker communities,[citation needed] but in fact the melodic material is derived from European scales and modes.