Sky Land - Super Mario Bros. 3

"Sky Land - Super Mario Bros. 3" is a high quality rip of "Sky Land" from Super Mario Bros. 3.

Joke
The first beat loops over and over, but changed to create a '50s progression (I-vi-IV-V). This could be a reference to "Okay, Everyone!" from Doki Doki Literature Club!, which uses that progression and has a similar rhythm (especially since the rip was uploaded during the start of Season 3).