Sita symbolises every individual soul and Lord Ram represents the true self, the universal soul.
The great Indian epic Ramayana vividly describes how Ravana, the demon king — representing the ego — kidnaps Sita and separates her from her husband Ram. And how Ram, with Hanuman as His messenger, wins Sita back.
When we sing to Sita and Ram, we call upon the divine powers that inevitably reunite our individual consciousness with the true Self within us.