As someone who Pavarotti looks like [I have been asked for his autograph on the street but now am getting a bit grey. He's a tenor, I'm a deep baritone.] I recognize that he had to be discovered by someone. If he had no desire to sing, it wouldn't have happened. He had to be out there and available to be tapped. Someone, somewhere saw him or heard him and said "You can be a star. All you have to do is work your butt off for the next X years and the world will know you."

I can't say for sure, but I don't believe someone walked up to him in the bakery for no reason and said this. He may have been doing it for pleasure but he had to have prepared in some way for that first break. As mentioned above, there is a very big difference between a trained voice and an untrained voice.