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 :
Missa Papae Marcelli
O.F.D This list is still incomplete