I fucking love video game soundtracks, from their inception to today. There are so many video games I've plaid that I don't think I would consider complete or good experiences without the soundtrack.
Please post links to good songs from video games in this thread.
One of my favorite songs is from Lufia II on the SNES: https://www.youtube.com/watch?v=WkwHKKWpoaE
I'm also always surprised how many simple yet beautiful melodies Koji Kondo created for zelda games.