This is a medley of American Music through time. It starts with a basic gospel hymn and eventually evolves into our National Anthem.
[A] Psalm 100 (1611)
[B] My Days Have Been so Wondrous Free (1775)
[C] The Liberty Song (1768)
[D] Yankee Doodle (the 1780's)
[E] The Star Spangled Banner (1812)
(None of these works are my own this is just a medley)