CASALI - Missa in G (complete) with organ 

Giovanni Battista Casali (1715-6 July 1792) was an Italian musician.
Casali was born in Rome in 1715. From 1759 until his death he held the position of choir-master in the Basilica of St. John Lateran. Casali was one of the last of his period to write for voices a cappella.
Sung live during Easter Traditional Latin Mass.
For full video of the Mass:
• Solemn Mass of Easter ...
Kyrie 00:08
Gloria 02:17
Sanctus 5:20 (and benedictus)
Agnus 7:08