From The National Liturgy Office website:

Learn the Catholic anthem Mō Maria. 

Two brief videos have been prepared to help everyone across the country learn to sing the himene Mō Maria. Over the years the versions, pronunciations and melodies of the hymn have varied from Pompallier’s original. As many people throughout the country are not familiar with the hymn, the rededication on 15th August feast of the Assumption, gives us an opportunity to promote Mō Maria as a national Catholic anthem.
These videos return to the source, the Hokianga, to learn the original text and melody from the locals.
https://www.nlo.org.nz/news-and-events/media-releases/solemnity-of-the-assumption/