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Music correspondent Kirsten Zemke looks at why non-lexical vocables or nonsense syllables are used in a variety of music genres.
Common examples include "la la la" or "da da da" and some go back to the Middle Ages.
They're often used as a filler or accompaniment in songs, particularly in choruses.
Kirsten shares some tracks with great examples. Kirsten Zemke is an ethnomusicologist at the University of Auckland's School of Social Sciences.
