Underground BGM (Beta Mix) - Super Mario Bros. 3

"Underground BGM (Beta Mix) - Super Mario Bros. 3" is a high quality rip of the beta mix of "Underground BGM" from Super Mario Bros. 3.

Joke
The melody has been changed to "Meet the Flintstones".

Trivia

 * This rip was originally named "Underground (Beta Mix) - Super Mario Bros. 3".