Sundays in Advent and Lent, XVII, in Gregorian Chant

 Unidentified performance:

Kyrie (X) XV-XVII s. [YouTube]

Sanctus XI s. [YouTube]

Agnus Dei XIII s. [YouTube

These recordings are live ones with much ambient noise, made at St. Benedict's Monastery in São Paulo (Brazil):

Kyrie (version A (Kyrie salve) X. s. 1.7Mb-91s wave file)
(version B (X) XV-XVII. s. 1m35.1s - 558 kb)
(version C XIV. s. 1m23.4s - 489 kb)

Sanctus XI. s. (1m23.2s - 488 kb)

Agnus XIII. s. (1m04.0s - 375 kb)