The music comes from Donkey Kong Jr., Nintendo's early 1980s arcade sequel in which Donkey Kong's son rescues his captured father, later released on the NES. Its title theme, credited to Yukio Kaneoka, uses the simple chiptune style of that era to set a bright, welcoming tone before play begins. As retro gaming grew on YouTube and streaming, the tune became a shorthand for Nintendo nostalgia, and creators still reuse it today to signal an old-school, playful start.