Please note that this list is no longer updated. To get an updated list of sites related to trailer music, please go here.
300 years later
http://www.300yearslater.com/
5 alarm music:
http://www.5alarmmusic.com/
615 Music
http://www.615music.com
Anti Hero
http://www.antiheromusic.com
APM Music
http://www.apmmusic.com
Apples & Oranges Music
http://www.applesandorangesmusic.com/
Audiomachine
http://www.audiomachine.com
Audio Network
http://www.audionetworkplc.com/default.aspx
Auracle Production Music Library http://www.auraclemusic.com/
Blue Labyrinth http://www.bluelabyrinth.net/
Boomerang Music
http://www.boomerang-music.com/
Boosey & Hawkes
http://music.booseytracks.com/home/
Brand X Music
http://www.brandxmusic.net
Brickwall Audio
Centurion Rage Records
http://www.centurionrage-records.com
CinemaSounds http://www.cinemasounds.com/
Cinetrax
http://www.cinetrax.com/
City of the Fallenhttp://www.cityofthefallen.com
Creative Soundscapes
http://www.creativesoundscapes.com/
Downright Music
http://www.downrightmusic.com/
Ear Tonic Music
http://www.eartonicmusic.com
EggChair Music
http://www.eggchairmusic.com/
Epic Score
http://www.epicscore.com/
ES Posthumus
http://www.esposthumus.com/
Extreme Music (Media Ventures)
http://www.extrememusic.com
Fired Earth Music
http://www.firedearthmusic.com/
FirstCom Music
http://www.firstcom.com/launchpage/FirstCom/
Future World Music
http://www.futureworldmusic.com
Groove Addicts
http://www.grooveaddicts.com
Groovers
http://www.groovers-music.com/
Howling Entertainment
http://howlingentertainment.com
Immediate Music
http://www.immediatemusic.com
Imperativa Records http://www.imperativarecords.com/
Kerry Muzzey
http://www.kerrymuzzey.com/
Kevin Manthei Music
http://www.kmmproductions.com/
Machinevandals / Methodicdoubt http://www.methodicdoubt.com/machinevandals/
Magic Box Music
http://www.magicboxmusic.com/
Manhattan music
http://www.mpmmusic.com
Master Source
http://www.mastersource.com/
Megatrax Music
http://www.megatrax.com/
Music Beyond
http://musicbeyond.com
Music Junkies
http://www.musicjunkies.net
Music Media Factory http://www.musicmediafactory.com/
Musikvergnügen
http://www.musikvergnuegen.com
Non-Stop Music
http://www.nonstopmusic.com
Nugel Broz. Music
http://www.nugelbrosmusic.de/
Opus 1 Music http://www.opus1musiclibrary.com/
Online Production Music http://www.onlineprodmusic.com/
Parodifair
http://www.parodifair.com
Pfeifer Broz
http://www.pfeiferbroz.com
Position Music
http://www.positionmusic.com/
PostHaste Music Library http://www.posthastemusic.com/
PP Music http://www.pp-music.net/
Richard Jacques
http://www.richardjacques.co.uk/
Rip Tide Music
Robert Etoll / Q-Factory
http://www.robertetoll.com
http://www.qfactorymusic.com
Select Tracks
http://www.selectracks.com
Sencit music
http://www.sencit.net
Spider Cues
http://www.spidercues.com/
Sonic Elixir (not open yet):
http://sonicelixir.com/
Sonic Symphony http://www.sonic-symphony.com/
Sonoton http://www.sonoton.com/
Sorman Nystrom Music
http://www.sorman-nystrom.com/
Static Music
http://www.staticmusic.com/
Sycross Music http://www.sycrossmusic.com/
Synchronic
http://www.synchronicmedia.com/
Swag Music
http://www.swagmusicgroup.com/
Two Steps from Hell
http://www.twostepsfromhell.com/
Underground music http://www.thehardstoremp3.com
Universal Publishing Production Music
http://www.unippm.com/
Veigar Music
http://www.veigar.com/
Videohelper
http://www.videohelper.com
Wild Whirled Music
http://www.wildwhirled.com
X-Ray Dog
http://www.x-raydogmusic.com
Zoo street music:
http://www.zoostreet.com/
Figure and Groove music
http://figureandgroove.com/
Music Roasters
http://www.musicroasters.com/
RedCola
http://redcola.com/
Shockwave Sounds
http://www.shockwave-sound.com/
1Revolution Music
http://www.1revolutionmusic.com/
Moss Landing
http://mosslandingmusic.com/Moss%20Landing/Home.html
Soundcritters
http://www.soundcritters.de/
RedArc - Fringe Elements
http://www.redarcmusic.com/company.php
African Planit music
http://www.africanplanit.co.za/
yay, thanks guys!!
Oh, sh*t! I always knew i forget something, now its clear what was it. Thanks, Erik! 
Don't worry Erik, we didn't forget Brickwall Audio! We just sort of assumed that since you are so awesome that everyone already knew about it! However, seeing as my doggy did not get excited when i mentioned your name, this needs to be remidied. Our mistake!
Guys, didn't you forget anyone in that list? ;)
List updated. Its pretty long now, huh? :)
Ear Tonic Music:
www.centurionrage-records.com can you add this it's my new company ?
you can find a trailer (bathory) with macbeth song (with real choir) taken from Prometheus Rising Vol I on my FB page http://www.facebook.com/home.php?#!/pages/FDL-trailer-and-film-composer/248806353234?ref=ts
Please, continue! :P
And you can remove Nemesis Music, as this is a big joke, there's probably only a dreaming boy behind that:
- first, the domain name: http://ost-zone.z-host.ru/ ... no comment.
- then, the title: Nemesis Music - The Prouduction...
- listen to the only music on the website: it's not from them, it's Megatrax, album 118 - Movie Showcase 4 - track: 46 - Coliseum Games (used in a war preview video of The Chronicles of Narnia btw), composed by Timo Spekkens.
- the tabs Home, Music, Credits are the same, with a list of styles, but we can't click them to listen to samples
- No samples of music they could have composed
- No credits, to show where their music is used
- No info about any composer, albums...
- For those who possess some music "of them", it's just bad remixes of Immediate Music & co.
If I didn't persuade you... :P
The new librairies: City of the Fallen, Wild Rumpus Music, Fired Earth Music, Sonic Symphony.
There's also Blue Labyrinth, Downright Music, Universal Production Music, Swag Music Group, Online Production Music, Imperativa Records, FirstCom.
And, could you put the last names in alphabetical order?
Of course if you find a library is not listed here, post it here so i can update the list.
Wow! great post!
