Palestrina was one of the most important old authorities out of Middleage before of J.S.Bach.Together with O. d.Lasso. he was european authority for tonal counterpoit / Kontrapunkt music composing following to christian church laws especially choir music for centuries.He wrote more than 100 christian Messes.

Most important tunes :

Agnus Dei,
Adoramus,
Missa Papae Marcelli

O.F.D This list is still incomplete