A pontoon specially imported from China provides a floating stage for the night. It will be clipped to side of the paddlesteamer Waimarie, which will be moored, along with the smaller Wairua, creating the backdrop for the concert.
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Over time the school has sent numerous talented singers on to the world's opera stages, including tenor Simon O'Neill and award-winning soprano Isabella Moore.
A pontoon specially imported from China provides a floating stage for the night. It will be clipped to side of the paddlesteamer Waimarie, which will be moored, along with the smaller Wairua, creating the backdrop for the concert.
A floating pathway will lead from the bank on to the pontoon, where the 21 singers from the school and featured soloists will perform.
Alver said the evening would begin at 7.30pm with the arrival of a waka from Putiki, singers accompanied by the haunting sound of a conch shell.
"The waka will lie alongside the Waimarie during the concert.
It would be a concert of love.
"Of love for Whanganui and its heart, the river. This is a deep and abiding love and the beautiful Māori aria Whaka-aria-mai will be sung."
"There will be at least one other aria sung in te reo. The Māori language translates so well into opera it's akin to Italian."
With the blessing from the guardians of the Whanganui River, it promises to be a memorable night of music, he said.
Huge specialised lighting, two large screens and exceptional sound gear would be set up for the night, he said.
And former students working in opera houses around the world will be featured in special video on the large screens.
Audience seating will be on the grass area that slopes down to the river just off Taupo Quay and a VIP area with tables and chairs. Bookings are available at the Royal Wanganui Opera House.
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Accompanying music will be provided by keyboards and a small ensemble made up of musicians from Whanganui Brass.
There will also be a VIP area with tables and chairs. Entry is $35 with concessions for seniors and children.
The Putiki Kapa Haka group will perform in a programme that will include the rousing and beautiful ensemble piece from Wagner's opera The Flying Dutchman, the Norwegian Sailors' Song.
As well as crowd favourites, Nessun Dorma from Turandot and the duet from The Pearl Fishers will be performed.
The concert is sponsored by the Whanganui District Council and Creative New Zealand.