While by no means exclusive to the Anglosphere, the tradition of choirs of men and boys has remained strong in the church of England. The practice of Cathedrals or large church’s having schools to educate the choirboys continues in some parts of the Anglosphere.
Here are some interesting documentaries that I found on you tube after I heard this wonderful rendition of the 50th Psalm by the King’s College Choir. A documentary about the King’s College choir is here, here, here, and here. A documentary of the St. Paul’s choristers is here, here, here, here, and here. A documentary about St. Thomas Choir School is here, here, here, and here.