Bangor Cathedral has first all-girl choir in 1,437 years
13 November 2012 Last updated at 08:57 GMT
More than 1,400 years of tradition has just come to an end at Bangor Cathedral.
For the first time, a choir of girls has been chosen to perform a role historically taken by boys.
It is a change that is also gradually happening across the UK.
Rob Thomas met the choir.