"There are 56 violins, three cellos, 18 flutes - besides that we have got recorders for about 20 younger players, they blend in surprisingly well with the rest of the orchestra," event organiser Ngaire Shand said.
"It creates an opportunity for young children to experience being in an orchestral group; some of these schools don't even have an orchestra."
Schools taking part are: Hastings Intermediate, Havelock North Intermediate, Te Mata School, Taikura Rudolf Steiner, Hastings Christian School, Pukehamoamoa School, Hereworth, Woodford House, St Marys, Haumoana, Heretaunga Intermediate, Iona College, Waipukurau Primary, OngaOnga, Taradale Primary, Taradale Intermediate, Mahora and Porritt.
After polishing the performance, students will hold a 1.30pm concert, open to the public for a gold-coin donation.