The Greatest Discovery by Elton John is a touching and sentimental song that tells the story of a young boy discovering the birth of his new sibling. The song beautifully captures the innocence and wonder of the child as he experiences a life-changing moment. Key themes include family, love, and the profound impact of new life. Particularly poignant moments include the descriptions of the child's anticipation and the deep bond that forms instantly upon meeting the newborn. The song is characterized by its tender lyrics and emotive melodies, making it a timeless piece about the beauty of family.