[gutzmank]

I know it’s not precisely what you had in mind, but these are my favorite ancient/medieval pieces. First, in Greek:

http://www.amazon.com/Divine-Liturgy-St-John-Chrysostom/dp/B0000260SW/ref=sr_1_8?s=music&ie=UTF8&qid=1409978020&sr=1-8&keywords=orthodox+liturgy+of+st.+john+chrysostom

Then, in Slavonic:

http://www.amazon.com/Russian-Medieval-Chant-Orthodox/dp/B0000260SL/ref=sr_1_9?s=music&ie=UTF8&qid=1409978106&sr=1-9&keywords=orthodox+liturgy+of+st.+john+chrysostom

That Greek one, in particular, is very well done. Note the recitation of the Lord’s Prayer in the Biblical and the Nicene Creed in the original language.