Elton John's 'Someday Out of the Blue' is a reflective ballad that delves into feelings of nostalgia and longing. The song captures the essence of looking back on a past relationship with a sense of hope that one day, unexpectedly, those cherished moments might return. Key themes include love, reminiscence, and hope. Particularly poignant moments in the song are found in the heartfelt lyrics that speak to the pain of separation and the enduring hope for reconciliation.