One night, Iduna sings the lullaby to Anna and Elsa to send them to sleep. With Anna in bed, Iduna continues to sing to Elsa in her arms. It contains hidden meaning about the past, and the lyrics become significant later in the lives of the sisters when they venture out to find the source of a mysterious voice.
Iduna: Where the north wind meets the sea
There's a river full of memory
Sleep, my darling, safe and sound
For in this river all is found
In her waters, deep and true
Lie the answers and a path for you
Dive down deep into her sound
But not too far or you'll be drowned
Yes, she will sing to those who'll hear
And in her song, all magic flows
But can you brave what you most fear?
Can you face what the river knows?
Where the north wind meets the sea
There's a mother full of memory
Come, my darling, homeward bound
When all is lost, then all is found
- The lullaby was also sung to Iduna by her mother.