O Vos Omnes composed by Tomas Luis DeVictoria. Arranged by Raymond Sprague. For SSAA choir (a cappella). Janet Galvan Women's Choral Series. General, Lent, Sacred. Medium. Octavo. Published by Roger Dean Publishing (LO.15-1400R).
Originally published in 1585, this motet for women's voices is in the typical polyphonic style of Victoria -- and it is a must for serious treble choirs.