"Ground Theme" (though most commonly and simply known as the "Super Mario Bros. theme") is the main theme of the cult classic game Super Mario Bros. It was composed by Koji Kondo, who would end up composing most of the sequels' soundtrack as well; as for most of its compositions, Kondo's idea behind it was to create a song that people could listen in loop without being tired of it. It plays during the overworld levels, which compose more than half of the levels in the game.
The track immediately became the main theme of the series and Mario's leitmotif, being rearranged and reused literally dozens of time for the numerous sequels and spin-off games of the Mario franchise, though usually only used for secret areas and nostalgia levels. Some of its more famous variations include the "Title Theme" of Super Mario 64, "Secret Course" in Super Mario Sunshine which is an a cappella rendition, a calm piano rendition played on the stage "Mushroomy Kingdom" in the Super Smash Bros. series, or the infamous "Do The Mario" ending song from the The Super Mario Bros. Super Show!
The theme is arguably one the most famous video game melody of all time, known all around the world even by non-gamers. It is conversely one of the song with the most covers ever made. Although it was originally made with the Famicom 5 tracks chiptune set, the theme is nowadays commonly associated with saxophones, xylophones, and pianos.
The first "Ground Theme" uploaded on both the GiIvaSunner channel and the new SiIvaGunner channel was "Overworld - Super Mario Bros.", a mashup with the "Do the Mario" song, respectively on February 28, 2016 and April 17, 2016. However, the name was eventually retconned to Super Mario Bros. Music - Ground Theme to make it look similar to the one uploaded on the true GilvaSunner channel (in the original spirit of bait-and-switch).
There are currently 13 high quality rips of "Ground Theme" on the channel (not counting the "Secret Course" rips), 9 of them being the original rendition in the SMB playlist, 1 of them being the "Title Screen" from SM64, 2 of them being the "Mushroomy Kingdom" version (1 for Super Smash Bros. Brawl and 1 for Super Smash Bros. 3DS), and finally a special cover in the "Mario Series for Guitar" playlist.