jennifer mistroe of our san francisco station kpix reports. ♪ ♪ >> i thought i was stupid.hought i was just going to be disconnected with everybody. >> reporter: patrick burton is no ordinary choirboy. but, this isn't an ordinary choir. ♪ the sign said long-haired freaky people need not apply ♪ >> reporter: it isn't a church. ♪ silent night >> reporter: and they do sing hymns. but patrick and some others here belong to a particular club many of us will never sing with. they have been homeless. >> i would say three times, three times in my life. >> reporter: homelessness is a polarizing issue in san francisco. the idea behind the singers of the street choir is two-fold. first, provide a safe space for homeless to sing out about their feelings of isolation. second, get people singing side by side with people who are homeless and those who are not. >> one of the things that's missing for homeless people in cities is a chance for socialization and for community. san francisco's definitely a place that needs that. >> reporter: this three-month-old choir is modeled after similar