I recently downloaded the The Anaphora of St Mark by the Higher Institute of Coptic Studies and was shocked that they had a tune to it.
According to some reliable sources such as Cantor Mikhail Gabrial Guirguis el Batanouny, the tunes of this liturgy have been lost except for the dyptich (owoh nai nem).
If this is really the case, the where did Fr. Matthias Nasr get that tune from (who did he learn it from)?
Looking forward to some good replies