VGMusic - Video Game MIDI Music from NES, SNES, N64, GameCube, Gameboy, and others.
20v - Create a custom music channel based on a single song
BitMidi - 🎹 The wayback machine for old-school MIDI files
BeatSense - Discover great music hand-picked by real people, in a single click. FREE and in real-time!
The Midi Shrine - A collection of MIDI files for SNES, NES, GameCube, Game Boy, and others.
Deezer - Deezer is a music streaming app created in France. It is available in 180 counties and gets 16 million users a month. 6 million of the users have paid subscriptions. Read more about Deezer.