Erin Page and Belle Perrottet, both Year 12 students at The Armidale School, have been selected to sing with the national Gondwana choir Latitude 34 at the festival.

It will include a week of rehearsals and workshops based at Ascham School and The Women's College at the University of Sydney, from July 10, bookmarked by gala performances at the Opera House.

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Joining Latitude 34 through the week will be the Riga Cathedral Girls' Choir from Latvia, the Estonian Television Girls' Choir, the Guandong Experimental Middle School Choir from Guangzhou, China and the Indigenous Children's Choir, amongst other ensembles.

"Belle and I were selected through the standard Gondwana Choirs audition progress when we auditioned in late September last year," Erin said.

"We were placed in the choir Latitude 34 which meant we were automatically invited to perform at the 'World Choral Festival'.

"We are fortunate to be the only choristers from Armidale performing at such a prestigious event."

The broad repertoire features works by various contemporary international composers, some of which will be performed for the first time. Evening concerts will be broadcast live on ABC National Radio.

"I am really looking forward to having the opportunity to perform at the Sydney Opera House in debuts of newly created work by a prestigious Australian composers and singing with choristers from around the world.

"It will also be great to see my friends in the choir that I haven't seen since January," Erin said.