O quam gloriosum by Victoria, being sung in Canterbury Cathedral by St Stephen’s Church Choir, Canterbury. The choir were right up in the far East End of the cathedral by this point, which is why it sounds rather distant. Watch out for the dog coming into the Quire at around 1’40"!
Video Source: A Dog at Evensong enjoying Victoria’s O quam gloriosum – YouTube Uploaded on 19 Feb 2012 Stephen Barker
Found via: ImpartialYNWA‘s channel