At the moment, I'm going to have to say Perfect Dark Zero. Although there was many things about the game that could have been made better, the music is dead on, it all fitted in the levels, and the game in general perfectly. Easily the best original soundtrack in a game for a long time
Inparticulary the last boss music, when it starts playing the main theme from the original N64 Perfect Dark. Simply awesome.
FF and Battlefront 2 both have nice music. However, the Silent Hill compositions are the best in the industry for me. Creepy and melodic at the same time.
Dearly Beloved from Kingdom Hearts 2 and Hikari Orchestral and many more from KH series. Yoko Shimomura is a very talented musical artist and her work in KH series and many more games is outstanding and beautiful. Dearly Beloved is just so peaceful it makes me tears...right that aside. For music I like for fun that be the Sonic series. Especially that rush game with it's crazy lyrics and pop like techno rap theme. Can I say, "Taketh' taketh' heat! Taketh' max smack face! Uhha!
Taketh' heat heat! Righyinmy face! Uhha!
I'd probably have to say the original Mega Man series music, from 1-6 only. Jeez I remember spending so much time on the net looking for remixes of the songs. Capcom back then were pretty good at composing the technoish upbeat music.
I think some of the best music is from Mario and Luigi:SSS, I loved the boss battle and the Popple battle, and Popple is one of my all time favorite video game villians. What else do I like?
I loved the Nascour battle theme, it wouldn't have worked well in other battles, but it worked there. It would have been better if they thought of actual music, however. But it was great all the same.
Too many...
The music in Dr. Mario o_0 yeah, yeah, I know...
Banjo-Kazooie's Click Clock Wood music was fun (spring)
Tetrisphere had some good techno in it. I liked Extol.
And some of the music in Alien Hominid (haha, not the flash game), especially level 3-1, the PDA game, and some mini game where you have to shoot everything in some level that looks like level 3.
Morrowind's theme
And Fable's main theme was pretty cool too, if a bit blank.
And too many more after that.
There's tons of music I like that came from video game. Since I'm too lazy to list them all, I'll say that I've been listen to Megaman Music right now (classic to EXE). There's tons of great tunes, and OCremix also helps how much I like music from video games.