Basket Baby of 1950

A few sites about true stories focused on and around religion mention that in 1950 a gospel singer named Mary once found herself dealing with a "real life Baby Moses situation." Apparently, she was a rather prominent supporter of the concept of adoption, and someone decided to test how much. They left a baby on her doorstep in a basket. According to the sites, she adopted him without question and raised him as her own son. Although it wasn't national news, in many circles he became known as the "Basket Baby" and he even went on tour with her as he grew up. None of the websites state who the woman or baby were, likely to prevent people from looking into either of the people too closely. From context, you know that it's Mary-Beth Clementine who would later be shunned due to her personal life and her son Mark, who would later be known as Crocodile Clementine.