Simply Piano - Fast and fun way to learn piano

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

Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.

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

Yousician - Learn to play music at home, at your own pace

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