CBS NEWS SUNDAY MORNING today on CBSNews.com launched SUNDAY MORNING'S ESSENTIAL AMERICAN SONGBOOK, a multimedia look at the songs that make up the fabric of America.The digital feature is part of CBS NEWS SUNDAY MORNING's special-edition celebration of the country's 250th birthday.CBS NEWS SUNDAY MORNING has asked notable Americans which songs best capture the American spirit. Ninety contributed to the project, including Stephen King, James Taylor, Cyndi Lauper, Joan Baez, Candice Bergen.