This week on "Sunday Morning" (June 28)

The Emmy Award-winning "CBS News Sunday Morning" is broadcast on CBS Sundays beginning at 9:00 a.m. ET. "Sunday Morning" also streams on the CBS News app beginning at 11:00 a.m. ET. ( Download it here .) Jane Pauley hosts a special program celebrating our nation's semiquincentennial: "These United States - America at 250." Essential American songs of the last 250 years 31:08 MUSIC: The "Sunday Morning" Essential American Songbook | Watch Video What are the essential American songs? Ahead of the nation's 250th birthday, we asked that question to "Sunday Morning"'s familiar faces, from performers to artists and writers to community leaders to nominate songs by American artists. The results: 250 songs that span eras and genres. Check out our Spotify list of their choices, and read an essay by Bill Flanagan. COVER STORY: The Founding Fathers: Why their radical beliefs continue to shape America The men who signed the Declaration of Independence were flawed, but what they did in the summer of 1776 changed the world forever. Correspondent Mo Rocca talks with experts about how 18th century colonists such as Thomas Jefferson, Benjamin Franklin and John Adams defied a king and proposed a government of the people, and how their fight for equality continues today. For more info: Danielle Allen, director, Allen Lab for Democracy Renovation, Harvard Kennedy School, Harvard University "Our Declaration: A Reading of the Declaration of Independence in Defense of Equality" by Danielle S. …