The song "Mother Big River" by Jessica Pratt tells the story of a person who is followed by a mysterious figure throughout their travels. The figure is described as being present in places where "dark water and fortune runs," and as following the protagonist wherever they go. The song also references the protagonist's parents, neither of whom seem to know where the "big rivers flow." The lyrics suggest that the "big rivers" symbolize some sort of unknown or elusive truth that the protagonist is searching for. Despite their travels and encounters with the mysterious figure, they still feel uncertain and lost, unable to find the answers they seek. The song's melancholic tone and haunting melody further evoke a sense of wandering and longing. Overall, "Mother Big River" is a poetic meditation on the mysteries of life and the human quest for understanding and meaning.