Bar 1 : Major chord on the fourth note of the scale - setting out on a new adventure.
Bar 2 : Minor chord on the fourth note of the scale - a slight hint of danger.
Bar 3 : The Major Chord of the Home Key - We're safe!
Bar 4 : A Seventh based on the sixth note of the scale - Oh no, someone has just made us laugh.
Bar 5 : A Seventh based on the second note of the scale - one corner yet to turn.
Bar 6 : The Dominant Seventh - always the last step before Home.
Bars 7 and 8 : The Major Chord of the Home Key again - this time for good.
Here's how it looks in the Key of G:
At The Mardi Gras
Beneath Hawaiian Skies
Who's Sorry Now
Some tunes essentially use the Sunshine sequence, though with slight or subtle variations.
When I'm Sixty-Four.