It was one of six themes composed for the game by Nintendo sound designer Koji Kondo, who found it to be the most difficult track to compose for it. New Super Mario Bros. music that has been extended to play for at least 15.5 minutes. Music: Overworld Composer: Hirokazu Tanaka Playlist: http://www.youtube.com/view_play_list?p=C574FCCF19998F17 Platform: Game Boy The theme is set in the key of C major and features a swung rhythm with prominent use of syncopation. There are a few fixes I would make to make this more like the real Overworld Theme, like fixing a few notes and making it faster, but overall it was a good easy … In later installments with more powerful so… The Super Mario Bros. theme, officially known as the "Ground Theme" or "Overworld Theme", is a musical theme originally heard in the first stage of the 1985 Nintendo Entertainment System video game Super Mario Bros.. Super Mario Bros (NES) Music - Overworld Theme Download all my NES Soundtracks as MP3 here http://www.nes-snes-sprites.com/