The sound comes from My Singing Monsters, the music building game released by Big Blue Bubble in 2012, where collectible monsters each sing or play a part of an island song. As players breed and place more monsters, the tune grows richer and more complete. The game built a large fan community online, with players sharing island recordings, remixes and fan made monsters that expand the official cast. Short singing clips are still shared because the harmony is instantly recognisable to fans and works even without gameplay footage.