Their crowing must have something to do with their respiration & their anatomy. I remember seeing a photo of a rather complicated many-lobed tube (esophagus? trachea?) that roosters have in their throat to enable them to crow. I just tried to look up more info and didn't find anything easily, please share if you have good info. It seems that roosters need to flap their wings several times before they crow in the middle of the night, I don't notice this behavior as much during the day. I wonder if they need to pump up their tubes with air before they can crow.
I don't mind the sound of most roosters' crowing, although once in a while there will be a bantam with an irritatingly shrill voice. We had a Sebright with a crow like a rusty wind-up toy, were so glad to see the end of him. There was also a handsome white Jersey Giant with a crow like Barry White, deep baritone and compelling, you could listen to him all day long.