Lullaby

Once upon a time
There was a pretty fly
He had a pretty wife
This pretty fly
But one night
She flew away
Flew away
She had two pretty children
But one night
These two pretty children
Flew away
Flew away
Into the sky
Into the moon

A haunting lullaby, opening the scene at 0:30.
The Lullaby, appearing later in the scene at 3:50, is sung by Kitty White. Walter Schumann, the composer, reportedly personally discovered her in a nightclub.
The scene is taken from The Night of the Hunter (1955), a cult film directed by Charles Laughton and starring an unforgettable Robert Mitchum.
And a child shall lead them.