sentences:  It is one of only two small number of choir schools in the Southern Hemisphere, since Christchurch Cathedral is the only Anglican cathedral in New Zealand to have an English-style male-only Cathedral choirs.Almost immediately after its establishment, admission to the school was also opened to boys who were not choristers, and girls were accepted into the school from 1988.Unique amongst Christchurch schools as well as New Zealand primary schools, Cathedral Grammar provides single sex education to both boys and girls on the same grounds with the Girls' School opening in 1995.