Guerrero wrote two settings of this joyful Antiphon. In an intimate four-part version he used the local Spanish chant melody, but he produced the present grand eight-part one using the Roman melody, well known throughout Christendom. This came out in the Liber Vesperarum
of 1584. Not startlingly antiphonal, it nevertheless is for eight voices distributed as two equal choirs. The ringing ‘Alleluia’ endings of each section show how vigorous Guerrero could be. It gives the lie to the impression that used to be passed on by music histories that would have Guerrero over-sweet, lacking the strength of Morales and Victoria.
from notes by Bruno Turner ę 1999