he had caught one of the radio announcements on his way home from work. >> theo harris: i pulled the car over to the side of the street. i said, "this is what i've been waiting for." there. >> harris: i'm there. that's for me, yes. >> stahl: debbie bingham, 56, needed a steady job to raise her family, so she became a nurse. >> debbie bingham: i worked in pediatrics, in the trauma center, so i did a little bit of everything. >> stahl: did you ever dream of being a professional singer? >> bingham: all the time. >> stahl: renee walker, also 56, works for her local school district. >> renee walker: when i started working there, i told myself it would just be a temporary job until i made it as a singer. so, i've been there 31 temporary years. >> stahl: in some cases, the talent was obvious. in others, like a 75-year-old named matthew brown, a little less so. >> higginsen: oh, matthew brown. when he walked through the door, he came in... he was bent over, looking down, and i was thinking to myself, "what's gonna happen here?" for this show." know. i mean, look at... whew. >> stahl: she look