Near every song in near every Command and Conquer game is either made of pure concentrated awesome of the combat, searching or construction variety.
You can even listen to a lot of this Crowning Music here using the jukebox.
What C&C theme could possibly top Hell March? Why, only the first music you hear when you play the original Command & Conquer, the music that defined the game and set the standard subsequent entries in the series strove to match. Ladies and gentlemen, three words: "Act on Instinct".
Valves. The first track you hear in the game (assuming you weren't playing as Nod scum), which like Act on Instinct before it set the tone for the next entry in the Tiberium sage - dark, futuristic, and apocalyptic.
Dusk Hour single handedly the creepiest song in the entirety of the Command and Conquer soundtrack (Red Alert included).
The only other song that can contest that is the aptly-named Gloom, at least in its first half of the song.
Nod crush is really popular as a nod theme, it also gained a remix for the Renegade mod Reborn.
Link-Up, typically playing in the last mission for Tiberian Sun Firestorm (either side), this piece doubles as a Crowning Moment of Awesome, both for the atmosphere of the moment and for making a piece of music around the old modem dial-up noises that we're all familiar with.
"Infrared", a drum and bass-esque song that goes really well with stealth operations.
And then there's this rarely-heard track, "Initiate," which was intended to be used in Firestorm. Its absence is conspicuous, considering its absolutely awesome segue from ominous techno to rockin' metal.
Destructible Times, the end credits theme for the Brotherhood of Nod campaign in the original game.
Hell, all of the C&C3 stuff is pretty good. Might not be Frank, but it's still good stuff. There's a great sense of urgency and panic in the combat themes (Deadly Force, Renegade Attack, Apocalypse) that suits the sudden arrival of the seemingly unstoppable Scrin, GDI's all-out assaults, or NOD's multi-pronged Mind Screw-based offensives, and an apocalyptic ambience in pieces like Gathering Intel.
If there is one redeeming feature of the seemingly ruined forever C&C4, it has to be this: To The Death.
Or Prophet's Ascension played in the final cutscene of the game. The whole soundtrack reflects the games relation to the previous incarnations of the Tiberum series: has nothing to do with it. Doesn't mean it's bad though.
Then there's "We Rise," which apparently got its start as a track for the cancelled game Tiberium.
The Fan Remake of Renegade (Renegade X) is worth mentioning too. Not only does it bring in remakes of old favorites (Act On Instinct, No Mercy, and of course, Stomp, among others), it also has its own unique, and rather awesome, tunes, such as Valiant and Blinded.
Red Alert Series
Hell March from Command & Conquer: Red Alert. The entire Soviet Red Army marching over the German border to crush the Allies into dust underneath massive tanks? BRING IT ON!
Both Tracks 1 & 2 of "Face the Enemy". They rival Hell March in diversity and awesomeness.
Needless to say, the entire soundtrack for the first in the Red Alert series is made of epic win, and ranks among the best music Frank Klepaki ever made.
Red Alert 2 (Includes Yuri's Revenge)
Destroy. If it weren't for Hell March 2 or Grinder, It would definitely be Red Alert 2's defining Epic Riff.
The menu themes from Red Alert 2 and Yuri's Revenge: Grinder and Drok respectively.
The loading theme in Red Alert 2, Jank, is an excellent song. However, it only appears in the loading screen and can't be played otherwise. The only way to hear the whole thing in-game is if your processor is slower than molasses that Carville'll be dipped in.
Of course you could explore the CD and extract it or listen to it on Frank's site...
Also from Red Alert 3, the Allies combat music (Shock and Awe) and the music it segues into when you're winning the fight ("How the West Was Won") are particularly awesome, and one of the few times dynamic combat music has sounded good.
It is supposedly the "epic" song, playing when someone reaches threat level 3. The Soviets have their own version too: Battleground of the Bear.
Red Alert 3's Grinder 2. Just pure awesome. Heck, you could practically see the Apocalypse Tanks, Tesla Troopers and Kirov Airships getting ready to pound the utter crap out of something when you listen to this.
The track on this trailer features George Takei singing All Your Base. That's right: It features GEORGE TAKEI singing ALL YOUR BASE ARE BELONG TO US.
While very, very different from the usual C&C offerings, Generals is full of musical badassery. If you can listen to the GLA Anthem without an immediate urge to start blowing shit up, there is something very wrong with you.
Generals, while it didn't feel like a C&C game, did come up with music that fit the factions perfectly. This Chinese battle theme conjures up images of rank after rank of marching infantry, while this ambient music for the USA captures the feel of heroic resignation accompanying American troop deployments... and was actually heard at the Beijing Olympics, which is unintentionally hilarious.
The music of official Trailer of the Zero Hour expansion, after all these years you can still feel the emotion!
Something of an odd-one-out, the ninth Chinese track is downright spooky, and a complete case of Soundtrack Dissonance compared to the rest of the music. It's like it came from an entirely different game.
Before Command and Conquer, there was Dune II, which had context-sensitive midi music that matched the flow of the game. The battle music in particular is very well suited to get the adrenaline flowing. Klepacki reused many of the same melodies in Dune 2000, giving us some epic tracks such as Fight for power and Harkonnen battle.
Every single track in Dune Emperor. The Atreides tracks have this valiant hero feel while still being badass, and have been made by Frank Klepaki, who made 90% of all the command and Conquer music. The Ordos music is creepy and mysterious, and was made by Jarrid Mendelson who made about a third of the tiberian sun music, while The Harkonnen music goes towards a guitar-heavy rock sound that is surprisingly remiscient of the harkonnen music in the 1984 Dune movie. The Harkonnen music was done by David Arkenstone.