This post is for family and friends who like me (ten years ago) didn’t know about this song recently voted the most popular Brazilian song ever. I am listening to Susannah McCorkle sing Águas de Março and I found this lovely and thoughtful presentation in Wikipedia.
"All these details swirling around the central metaphor of "the waters of March" can give the impression of the passing of daily life and its continual, inevitable progression towards death, just as the rains of March mark the end of a Brazilian summer. Both sets of lyrics speak of the water being "the promise of life," perhaps allowing for other, more life-affirming interpretations, and the English contains the additional phrases "the joy in your heart" and the "promise of spring," a seasonal reference that would be more relevant to most of the English-speaking world."
You can read more about Susannah many places including this blog post of mine from 2007.