This is a piano cover of the Super Mario Bros theme slowed down and played in a minor key. It sounds sad. It also doesn't sound like the Super Mario Bros theme. It could have been the Golden Girls theme song for all I know, I'm tone-deaf and have never lasted in a band longer than one rehearsal before the rest of the members mutiny on me. "Did they make you walk the plank?" Of course they made me walk the plank, it's pirate law. I live by a code.
Keep going for the video.
Thanks to carey, who wants to know if the Sonic The Hedgehog Green Hill Zone theme song is also sad in a minor key.