For No One by The Beatles is a melancholic reflection on the end of a romantic relationship. Written primarily by Paul McCartney, the song captures the desolate feeling of realizing that a once-vibrant love has faded away. Key themes in the song include loss, heartbreak, and the passage of time as the narrator comes to terms with the emotional distance that has grown between himself and his partner. Poignant moments in the song include the repeated line 'A love that should have lasted years' which underscores the sorrow of an unfulfilled relationship, and the somber French horn solo which adds to the song’s emotional depth.