It's a tie:
"Oklahoma!"
Oklahoma
Surrey With the Fringe on Top
I'm Just a Gal Who Cain't Say No
O, What a Beautiful Mornin'
Everythin's Up to Date in Kansas City
People Will Say We're in Love
Out of My Dreams and Into My Heart
"Carousel"
When I Marry Mr. Snow
My Boy Bill
When You Walk Through a Storm
A Real Nice Clambake
And best of all... If I Loved You
Not going to say it's the greatest of all time, but I highly recommend the CD of The Phoenix Symphony Orchestra performing the musical score from:
THE MAGNIFICENT SEVEN.
It is absolutely first rate from start to finish.