The coolest secret video game music

What joy then, when your favourite videogame throws up an unexpected audio treat. One's come up recently in Mario Kart 64. Someone must've left the game running after a race, only to find that after 50 minutes the music changes to a different loop. Check it out: It's possible that it's just a glitch - the game was always meant to play this after a couple of rounds of the more familiar music loop. But