Soundtracks. Movie, Videogame, life.
 

Lemme break it down for you... I do a lot of writing after work, and when I write I like to listen to music. Problem is I can't listen to anything with lyrics because it's distracting. So I listen to instrumental stuff, mostly soundtracks and movie scores because they are the easiest to find in large quantities. But I'm getting kinda bored rehashing the same shit that I always listen to ad nausea. So, what's good out there? Right now I'm listening to quite possibly the BEST video game sound track
Uprising!
Very great, underrated game.
Also, I've got the Conan and Advent Children soundtracks loaded as well, but that's about it.

Just because it's about a third of the music I listen to at this point, I'll list some of my favorites from video games.

Metroid- The Prime series especially has some nice music, probably just due to being orchestrated/bigger. Overall the music from the series is awesome.

Mass Effect- Not as big of an oomph as some other examples, but still quite good.

Guilty Gear- METAL!! Also, awesome. VERY awesome.

Odin Sphere- Not a very well known game, but a good soundtrack. I'd recommend it, at least.

God of War- Ok, so only if you like big, booming, epic tracks. Because that's about half of the soundtrack. But it's still good stuff.

Smash Bros.- Got a favorite Nintendo score? Look here and it's probably there!

Mario Galaxy- Both are good, but 2 has some really epic stuff. And some happy stuff. And... well ok, it has a lot, and it's good.

And last but not least...

Halo- Say what you will about the games, but the soundtracks are incredible. Probably my favorite music from a game.

I'm a sucker for Super Nintendo-era videogame music (Chiptunes? Or is that exclusively 8-bit? I dunno). I'd recommend Kirby Super Star, Chrono Trigger, Lufia 2, and Super Mario RPG: Legend of the Seven Stars.

For more recent stuff, Ar Tonelico: Melody of Elemia (Or something to that effect, the title's long and I only ever remember the first two words anyway) has some great stuff, as does anything Pokemon related (My roommate has never played a game since Red/Blue, and he's got all the 4th gen stuff on his comp).

Unfortunately, most of the anime soundtrack stuff I have because it's sung by the voice actors/actresses, so it wouldn't help you any >.>

Big and Epic? Excellent. Metal? Even more excellent. I find instrumental metal is very hard to come by, and I put a premium on the stuff.

Apocalyptica is a band you might want to look into, then. I'm not a fan of their Metallica covers (Which is a LOT of their stuff), but it's mostly instrumental, and with a, well... Odd choice of instrument, I'll just say. I'd recommend looking up some on Youtube before finding out anymore on the band :P

Also, because this is easily my favorite remix ever, and doesn't require knowing the original tune to listen... Here.

I'm also a fan of listening to instrumental music while I write, so I might be able to help.

http://homestuck.bandcamp.com/
More specifically, Sunslammer, which is catchy and awesome, and Sunsetter, which is an equally bitchin' chiptune version of the same song.

Every Star, Every Planet is fun. Admittedly, most of Murray Gold's work for Doctor Who has been amazing, but I absolutely love this song. From the same series, there's something disturbingly catchy about Donna's theme as well.

Of course, as anyone could tell you, the Ace Attorney series has fantastic music, but you knew that, right?

I love OCRemixes. The only problem I have with them is it's like a tl;dr situation... you have to download every song before you can listen, and then download them when you like them... too much time. lol
Also, Apocalyptica is good. I like the Cello. Good suggestion.

http://www.bingegamer.net/wp-content...-objection.jpg
I did not know that.

Cheetahmen remixes are always great:
Metal, just for you: http://www.youtube.com/watch?v=-jH8WHaWcjw
"Acid," whatever that means: http://www.youtube.com/watch?v=ZrD6R9SES50
Orchestral: http://www.youtube.com/watch?v=j2yMLq-dmok
Fuck if I know, but it's interesting: http://www.youtube.com/watch?v=6kCAM...eature=related
A fun little MIDI: http://www.youtube.com/watch?v=zdTdsn5G8L8
Mixed with Phoenix Wright: http://www.youtube.com/watch?v=nsGDqBviJ0o&NR=1
Alternative: http://www.youtube.com/watch?v=SE8JinCP8qc
Club?: http://www.youtube.com/watch?v=Rw0la...eature=related
Techno-jazz?: http://www.youtube.com/watch?v=hmS8X...eature=related
90s techno: http://www.youtube.com/watch?v=IUeYd...eature=related
Some classy easy listening: http://www.youtube.com/watch?v=3hXex...eature=related

And many, many more!

Guild Wars has some epic and awesome music.

You may also be interested in Mythos, although they're very hard to find. Youtube only has 4-5 of their songs, and they're not even the good ones.

Super Earth Defense Force had some really rocking music.

Secret of Evermore had good music as well and interestingly enough it was composed by the same guy who did the Guild Wars music, Jeremy Soule.