BitMidi - 🎹 The wayback machine for old-school MIDI files

Synthesia - A fun way to learn how to play the piano.

VGMusic - Video Game MIDI Music from NES, SNES, N64, GameCube, Gameboy, and others.

Playground Sessions - Online piano learning game.

Sonos In-Wall Speaker - A speaker made by Sonos and Sonance that sits in your wall

Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.