Underestimated

In Old Compton Street, right in front of Balans Cafe, someone was exercising his tenor. I was impressed, for he was doing pretty well. A group of minicab drivers, gathered on a corner nearby, didn't share my views though.
"Shut up!"- shouted one of them and they laughed loutishly and loudly. You could tell that they really felt self confident and important, standing like that, on that corner, together.