Last week, prior to her hosting the CMA's, Carrie Underwood taped a segment for Jimmy Kimmel Live and it involved her surprising random shoppers in Nashville. The segment was callled "Undercover Sing". Carrie hid in the back of a boot store in Nashville, and as customers would come in, store employees would ask them to share a little bit about  themselves. Behind the scenes, Carrie would take what they said and turn it into lyrics that she would then sing over the intercom system.