I have 5 roosters, and it seems, I just bring out the best in them!! My first two started crowing at 4-6 weeks. My Serama crowed for the first time the night I brought him home, and my Golden Phoenix started crowing the same week he came home with me. The only one that has stayed silent is my Giant Cochin. But I have a feeling that when he decides to crow, the whole world will hear. He is going to be ENORMOUS! I hope he has a deep crow, as all my tiny roosters are quite high pitched.
I love their noises though. I lay in bed and count them all in the morning. I get worried if somebody misses their cue. My little barbershop quartet!