History
The History of the Feast can be found in the excellent Liturgical Year, by Dom Prosper Guéranger
Propers
The music of the Propers is explained in The chants of the Vatican Gradual, By Dominic Johner, OSB
Ordinary
Mass II and Credo I
MUSIC
Music for today from GABC Propers tool.
Extra Music
Deo Fruentes fulgidae Vespers hymn from the Ambrosian Breviary
Jesu Salvator Vespers and Matins hymn from the Dominican Breviary
Christe Redemptoris omnium Vespers hymn form the Roman breviary