Game MIDI music in the early to mid 1990s, the Roland Sound Canvas SC-55 and Yamaha MU80 were fantastic offerings and now great for a retro gaming PC setup.
MIDI files are extremely small as they contain only instructions of what to play, it's the Roland & Yamaha modules that contain the audio samples of hundreds of instruments. It did mean your game music could sound very different depending on your sound card's built-in MIDI capabilities or dedicated hardware.
