Several families from the Pike River Mine disaster will be at a concert in Wellington on Labour Day with more than 300 performers on stage.
The Wellington Youth Orchestra is performing Cantata Memoria at 2pm at the Michael Fowler Centre.
The work was composed last year by Sir Karl Jenkins to commemorate the mining disaster in Aberfan, Wales, 50 years ago.
On October 21, 1966 the colliery spoil tip slid down the mountain above the village, killing 116 children and 28 adults as it engulfed the local junior school and other buildings.
During the performance, original footage of the mining disaster from the BBC Wales Archives will be shown.
The concert in Wellington will also commemorate the Pike River disaster, where 29 workers died in the West Coast mine in 2010.
As a tribute to the Pike River victims and families, Jenkins' well-known Benedictus from The Armed Man will also be performed.
The orchestra will be joined by a massed adult choir made up of singers from Wellington, Nelson, and Victoria, Australia.
A youth choir consisting of Wellington Young Voices, St Mark's School Chapel Choir and additional singers from Wellington and Nelson plays an important role in the concert.
The Cantata Memoria will be conducted by Dr Jonathan Griffith, principal conductor of Distinguished Concerts International New York, who also conducted the US premiere of this work in Carnegie Hall, New York, in January.
About 30 New Zealand singers were involved in that concert.