It's a battle between two musicals with men in tights: 1776 "Sit Down, John" and that Pied Piper movie with Van Johnson.
The song starts at 2:47, but watch from the beginning.
And the Pied Piper -- just start playing.
Every morning — or just about — I wake up with some snatchlet of music in my head. Some days it may take well past lunch for the theme from "What's Happenin'?'" to work its way out and I figure why should I suffer alone?