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Below is said to be a comprehensive list* of Cantors who taught the modern day Cantor Mu'allim Ibrahim Ayad:

(1) Mu'allim Milad (Beni Suif, when he was around the age of 13)

(2) Mr. Salib El Komos Dimitri (Ma7ed Didymus)

(3) Mu'allim Abu El Saad (St. George Kotsya - El Ma'adi)

(4) Mu'allim Nasif Abd El Messiah

(5) Mu'allim Farag Abd El Messiah

(6) Archdeacon Fahim Girgis Rizk (He is said to be the most influential and it is said he spent a lot of time with him)

(7) Mu'allim Sadek Attallah

(The Recordings of Mu'allim Mikhail El Batanouny from Dr. Ragheb Moftah when they were available)

*This list is partial, but suggested to be very accurate.