19. Sheryl Crow
Sheryl Crow an elementary school teacher. Right after she graduated college, she began teaching music at Kellison Elementary School in Missouri. Her teaching day job allowed her to perform music during the weekends.
Her first musical gigs were actual commercial jingles. She first did one for a popular department store in St. Louis and then moved on to doing jingles for Toyota and McDonald’s. She supposedly got paid $40,000 for the McDonald’s one.