The melody comes from the underwater theme Koji Kondo composed for Super Mario Bros., released on the NES in 1985. Its gentle waltz became one of gaming's most recognisable tunes, and fans have remixed it for decades across YouTube, TikTok and soundboards. This particular version rebuilds the theme with a modern electronic beat while keeping the original melody front and centre. Because the tune is tied to calm, weightless swimming levels, creators still reach for it whenever a video needs instant retro warmth.