Stevie Wonder's 'Yesterme Yesteryou Yesterday' is a nostalgic reflection on happier times in the past. It delves into themes of longing for the innocence and joy of bygone days, contrasting them with the present's hardships. The song poignantly captures the sentiment of loss and the yearning to return to simpler, more fulfilling moments. Particularly poignant lines include references to carefree childhood experiences and the realization that those days can never return, amplifying the emotional depth of the song.