Samus Aran explores the caverns of planet Zebes for power-ups to reach Mother Brain and the stolen Metroids — the game the Metroidvania grew from, and twelve 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.