It is meant to be a beautiful, melodic and spiritual start to the day.
But the morning calls to prayer by some of Istanbulâ€™s muezzins and imams have had locals plugging their ears rather than reaching for their prayer books.
The problem is such that following a flood of complaints by locals, special classes for the tuneless culprits have been set up.
Imam Mehmet Tas, one of the schoolâ€™s first pupils, said he was already feeling the benefits.
â€œI have so much more self-confidence now in my abilities to do all five calls to prayer in their correct tempos,â€ he said.
The improvement scheme was put together by Mustafa Cagrici, the cityâ€™s head of religious affairs, who is determined to make sure all of the cityâ€™s 3,000 mosques produce a beautiful call-to-prayer each morning.
â€œFor some reason, these imams were hired even though their voices are not good, they just canâ€™t sing!
â€œWeâ€™re doing our best to help our imams and muezzins to improve their singing.â€
He says that since lessons started, complaints have dropped from hundreds a month to just dozens, an improvement that can be credited to the singing teacher, Seyfettin Tomakin.
â€œI personally find a badly sung azan [call to prayer] very disturbing,â€ he said.
â€œThe azan is music, beautiful music that brings people to God, thatâ€™s why itâ€™s so important to sing it well.
â€œSure, there are some people who find it harder than others, thatâ€™s why some come here for a year. But my job is to find their voice to enable them to sing.â€
Sadly, for some, no amount of teaching will ever be enough.
â€œThere are some people who canâ€™t improve – no matter how much training you give them,â€ said Mr Cagrici.
â€œSo we connect their mosque, by radio, to a central mosque where thereâ€™s an imam who can sing.â€