http://www.youtube.com/watch?v=rhbGqHurV5I&fmt=18 for the HQ version!
See also:
Best VGM 236 - http://www.youtube.com/watch?v=tiwsAs6WVyQ&fmt=18
A collection of my favorite videogame music. Note that most of them are from games I played so I might miss some great ones from games I never played.
NES
Castlevania II: Simon's Quest
Bloody Tears
