When Gretchen Valade heard that Ford had pulled out as major sponsor of the 25-year-old Detroit Jazz festival, she stepped in to save the day. “The angel who saved the jazz festival has the bank account of a blue blood but the soul of an artist. She wrote short stories in her youth and standard-ballad pop songs as she got older, and when no one seemed interested in her music, she started her own record company. Valade’s fortune is homegrown — she’s the granddaughter of the founder of Carhartt Inc., the $400-million Dearborn company that makes rugged work clothes that have also become hip urban fashion.”