Mario runs, jumps and stomps through eight worlds of castles to free the princess from Bowser — Nintendo’s Super Mario Bros. on the NES, and eighteen tunes.

Nothing here was transcribed by ear: every note was read out of the cartridge and is played by an emulated NES sound chip — two pulse waves, a triangle and the noise channel, each on a keyboard of its own.

The music and the game belong to their composers and publishers; this site only shows how the cartridge plays it, for learning.