One Little Christmas Tree by Stevie Wonder is a poignant holiday song about a small Christmas tree that symbolizes hope and the possibility of new beginnings. The key themes include resilience, the spirit of Christmas, and the impact of a small gesture during difficult times. Particularly poignant moments in the song include verses where the tree's transformation from overlooked to cherished represents how simple acts of kindness and faith can bring joy and warmth to lives during the holiday season.