Have you buried your Alleluia yet?

Better hurry; it's almost time for vespers. As tomorrow is Septuagesima Sunday, vespers tonight will be the last time you hear Alleluia in the Roman Rite until Easter Sunday. In some old traditions, a highly illuminated manuscript copy of Alleluia was solemnly processed to the churchyard and buried until its "resurrection" on Easter Sunday.

From the old Catholic Encyclopædia:

Septuagesima is today inaugurated in the Roman Martyrology by the words: "Septuagesima Sunday, on which the canticle of the Lord, Alleluja, ceases to be said". On the Saturday preceding, the Roman Breviary notes that after the "Benedicamus" of Vespers two Alleluias are to be added, that thenceforth it is to be omitted till Easter, and in its place "Laus tibi Domine" is to be said at the beginning of the Office.

Formerly the farewell to the Alleluia was quite solemn. In an Antiphonary of the Church of St. Cornelius at Compiegne we find two special antiphons. Spain had a short Office consisting of a hymn, chapter, antiphon, and sequence. Missals in Germany up to the fifteenth century had a beautiful sequence. In French churches they sang the hymn "Alleluia, dulce carmen" (Gueranger, IV, 14)* which was well-known among the Anglo-Saxons (Rock, IV, 69). The "Te Deum" is not recited at Matins, except on feasts. The lessons of the first Nocturn are taken from Genesis, relating the fall and subsequent misery of man and thus giving a fit preparation for the Lenten season. In the Mass of Sunday and ferias the Gloria in Excelsis is entirely omitted. In all Masses a Tract is added to the Gradual.