Post your favourite video game BGM's here!

I'll start off with Golden Sun - practically the whole soundtrack from both games is absolutely fantastic, there's not a track I wouldn't listen to over and over again. One of my favourite tracks is the battle theme! I'll be posting it later here.

For me that would be Suikoden, the whole series. I instantly recognize any piece of music from those games and that usually makes me really nostalgic

Can you post some of your favourite tracks here?

I'm not good at posting links so I hope this works.

Suikoden 2

Miller

from The (Even More) Incredible Machine Soundtrack

Olof Gustafsson's Pinball Fantasies/Illusions soundtrack.
https://www.youtube.com/watch?v=Yml8PLtFyy4
https://www.youtube.com/watch?v=miTq0vw1_V4 (just one track, search for more!)

Frank Klepacki's work on C&C are all masterpieces.
https://www.youtube.com/watch?v=Z2MZzIhjlpY
https://www.youtube.com/watch?v=ttAMZfXpjgw
https://www.youtube.com/watch?v=CYwZKjqhnDI
https://www.youtube.com/watch?v=fqlb0p11RcE

Trent Reznor of NIN (a favorite band of mine) brooding ambient Quake soundtrack.
https://www.youtube.com/watch?v=f8_f8iF2T0g

Anything Alexander Brandon & Michiel van den Bos touched is amazing.
https://www.youtube.com/watch?v=tx8tFvrhmfI
https://www.youtube.com/watch?v=7MSFW8pZ-_4
https://www.youtube.com/watch?v=ZJl8t55yFbw
https://www.youtube.com/watch?v=_FwlHYbGRCk&list=PLBBE0619A3F2315CB

Front Line Assembly (one of my favorite groups) and Sonic Mayhem did the Quake 3 OST.
https://www.youtube.com/watch?v=3bYMKoueWq4&list=PL996FB4FA945EAFA9

Russell Shaw's odd blend for the Dungeon Keeper OST remains a favorite.
https://www.youtube.com/watch?v=O6iHgOEp0Fg

Matt Uelmen's legendary Diablo OST.
https://www.youtube.com/watch?v=S5MnLtAix4M

Daniel Bernstein & Guy Whitemore with the amazing soundtracks for Blood, Blood 2 and Shogo. Even when a game is absolute trash, more often than not the composers know their craft well enough that the music can still be really good. As is the case with Blood 2 and Shogo, both awfully designed games with really great OST's.
https://www.youtube.com/watch?v=0-OS06n2My0
https://www.youtube.com/watch?v=h4Nxtrebh9E
https://www.youtube.com/watch?v=GHXZlBBHJCk&list=PL6FF9FD5096C03ED7&index=2
https://www.youtube.com/watch?v=P8j-7koySr4

Nathan Grigg's chilling work on F.E.A.R.
https://www.youtube.com/watch?v=iw7LK1mP12E&index=1&list=PLE4A0595A547BDB28
https://www.youtube.com/watch?v=WdaikLCQ4Kg

Of course, I can't forget the fucking man, Adam Skorupa, who did the music you hear in The Witcher 1 & 2 and the much loved/hated Hatred.
https://www.youtube.com/watch?v=tFIbVqHOOIU
https://www.youtube.com/watch?v=npsAcevrIzk
https://www.youtube.com/watch?v=gE97G_By3_Y

The legendary Bobby Prince's DOOM soundtrack, impossible to forget.
https://www.youtube.com/watch?v=u78KNVbJsiU
https://www.youtube.com/watch?v=zyIxeMY820E

Kevin Schilder who is sometimes unfairly overlooked did the awesome music you hear in Heretic and Hexen
https://www.youtube.com/watch?v=dv9rZVsOknE
https://www.youtube.com/watch?v=7fispefQPGw
https://www.youtube.com/watch?v=DQG81JWtBFc
https://www.youtube.com/watch?v=6yvGyX6bdVg&list=PL0YFSLv6Row9EFFcdIbi2cZ_XtsGdLpcR

Tom Mustaine's Evilution music is kick ass.
https://www.youtube.com/watch?v=PkgNGr9E0VQ

Glenn Stafford's music still gets stuck on loop in my head to this day.
https://www.youtube.com/watch?v=pGl4slGxY8U
https://www.youtube.com/watch?v=xPoSAo7YFsw
https://www.youtube.com/watch?v=90H-ARdf1dw
https://www.youtube.com/watch?v=pNt0iVG2VOA

I could go on and on and on, so I'll end this post with Mark Morgan's Fallout 1 and 2 OSTs.
https://www.youtube.com/watch?v=vGyB093QOIo