"It's Been So Long" is best known as a Five Nights at Freddy's fan song by The Living Tombstone, released during the early wave of FNAF's online popularity in 2014. The track spread widely through YouTube animations, lyric videos and fandom edits, then kept resurfacing in short-form videos because its opening lines are instantly recognizable. It remains popular thanks to the overlap of horror, nostalgia and game lore, much like other internet-staple tracks such as running in the 90s.