See also:
Best VGM 66 - http://youtube.com/watch?v=vaJvNNWO_OQ
Best VGM 153 - http://www.youtube.com/watch?v=HFKtYCcMWT4
Best VGM 610 - http://www.youtube.com/watch?v=coyl_h4_tjc
Best VGM 700 - http://www.youtube.com/watch?v=heD3Rzhrnaw

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
Mega Man 2 (1989)
Metal Man
Manami Matsumae, Yoshihiro Sakaguchi & Ogeretsu Kun