My Arabic teacher showed us a video of a muezzin in Yemen singing (or more like shouting) the adhan....I think my ears are still hurting.
When she was in Yemen she heard the call to prayer and thought the muezzin’s singing was horrible...so she went to someone at the mosque and said “You need to replace this guy, he’s terrible!” And he said “Are you kidding? He’s one of our best ones!”
It must not be fun to hear that at 5 in the morning...and I thought alarm clocks were annoying!
Fortunately, I live in a hard building and don't hear the early morning adhan. (I also sleep through any sounds...and I mean ANY sounds. LOL)
Some of the muezzins sound almost like they're being strangled, and then I've heard some that are quite melodic.