Laughing can look like crying. Shouts of joy can sound like shrieks of distress. Ecstasy can look like anguish. 

Ecstasy and anguish go hand in hand and resemble each other for without one we wouldn't truly know the other. Without the light we wouldn’t know the shadow… without the anguish we would not know the ecstasy. Without the effort we would not recognize the victory.

This mother-daughter duo are in the ecstasy of the song. They begin, clearly in the bliss of the music, yet at the climax of singing, their expressions could be mistaken for anguish if taken out of context.