Man, seems like there’s no love for the Call of Duty 1 OST. :X
Pegasus Bridge - Call of Duty
Red Square - Call of Duty
Here are some songs from Radiant Historia for the NDS: (<3 Yoko Shimomura)
Edge of Green - Yoko Shimomura
Red Locus - Yoko Shimomura
Where the Wind and Feathers Return - Yoko Shimomura
And some more random stuff.
Abandon All - Killing Floor
Dark Void Theme - Bear McCreary
Star Wars: Rogue Squadron Main Theme
Muscle Soul - Anders Lewen - BC2: Vietnam
Dearly Beloved - KH: Birth by Sleep
Damn, there are a lot more out there, but I’ll post these for now.
I love that one! Thanks for the link. 
For me;
S.T.A.L.K.E.R.: Shadow of Chernobyl title music (Wasteland II)
https://www.youtube.com/watch?v=7mmsErpVQZQ&feature=related
Doom soundtrack
https://www.youtube.com/watch?v=aphvPIUHVXE
Halo music
https://www.youtube.com/watch?v=Sjvo0SPAOiQ
I love those tracks. CoD 1 had an amazing score. Gotta love Michael Giacchino.
As for some game OSTs I’ve been listening to lately:
Up, Up and Away - F-15 Strike Eagle II
Boss Fight - Rocket Knight Adventures
Restoration (Mota) - Phantasy Star II
Chemical Plant Zone - Sonic the Hedgehog 2
I’ve been on my Genesis a lot this week
Nobody ever mentioned Operation Black Mesa’s soundtrack? It doesn’t fit that much with the game itself I think, but the music is the most beautiful I ever heard, especially this one: https://www.youtube.com/watch?v=W6xOkLpe-tc
Oslo By Night: https://www.youtube.com/watch?v=VpJu5SQDcHw
Hundred Miles: https://www.youtube.com/watch?v=6Xsyn2AUBg4
Hospital: https://www.youtube.com/watch?v=5cRA0-miTi0
Medal of Honor Allied Assault (Main Theme): https://www.youtube.com/watch?v=-ELFxB-tGhE
It could be just me though but I always have the feeling that at one point in the song it sounds like the Star Wars Theme will begin.
Damn, that Normandy beach landing chapter is still edged in my gaming memory. No Call Of Duty could surpass that afterwards.
Megaman 3 is better.
And with lyrics, it’s great, too. 
EDIT: But if we’re going to the classics, then you can’t forget the Moon Theme from Ducktales.
Can’t only chose one track, so here are a few:
Medievil - Ending/Credits Theme
It is my opinion that the soundtrack of Portal 2 has been the best thing that could happen to both video game soundtracks and electronic music in years. People just don’t realise it yet.
I might blow your mind but there is an album of Megaman 2 rock covers with lyrics added https://www.youtube.com/watch?v=vudQURQ7OFc
They are working on Megaman 3 right now
Already posted this in another thread but:
https://www.youtube.com/watch?v=VQq4oZSjQWk
https://www.youtube.com/watch?v=CIGUsZ20LUk
and this
I can say the interface music(and everything non-radio) from Saint’s Row the Third is superior. The rips from PC version are torrentable.