For one week each year, the male half of the Today show's anchor team dashes around the globe, inviting viewers to figure out where in the world Matt Lauer is. But a task far more challenging than Lauer's exausting jet-setting ways rests squarely on the viewers: Just try to keep the series' theme song from sticking in your head. That's called a sonic brand, and it comes courtesy of 615 Music, a company in Nashville that started writing advertising jingles for local companies in 1984 and which now crafts theme music and songs for companies and TV shows in 30 countries.