Mary Smith McClain is torn between what she loves and what she feels is right.  For most of her life she was known as Diamond Tooth Mary, a dazzling blues singer who performed on star studded bills with Duke Ellington and Nate King Cole.  She turned her back on the blues and joined the Baptist church.  Her pastor said the music was evil.  And she believed him.  When Mary turned 82, her husband died.  Money got tight.  Old blues singers don’t have pensions.  She accepted an offer to sing in New York City for the first time in 42 years.